In Old School RuneScape, the title of Grandmaster has evolved. Once upon a time, this prestigious title was reserved for players who dedicated hours-often at the expense of their personal hygiene and sanity-to master the game's toughest challenges. In those days, Grandmaster status was the highest form of in-game respect. Fast forward to today, and while the title still holds weight OSRS gold, it's no longer as rarefied as it once was. With the introduction of powerful items, boosting Discords, and the ever-growing complexity of RuneScape's combat mechanics, the path to Grandmaster has become more accessible. That doesn't mean it's easy, though. Here are the 10 most difficult combat achievements you'll need to master to claim your spot as a RuneScape Grandmaster. 10. Melee Inferno (Facing Jad Headon 2) The first combat achievement on our list is a challenge that demands a deep understanding of the Inferno's mechanics and absolute precision in execution. Melee Inferno requires you to beat the Inferno without equipping ranged or magic weapons before facing Zuck. The strategy here involves the use of the Noxious Halberd, which allows you to attack from one tile away-thus avoiding melee attacks while maintaining optimal damage output. This achievement is one of the earliest signs of power creep, where newer weapons dramatically shift the way old content is tackled. Despite these updates, however, Melee Inferno remains a grueling test of skill. You'll need perfect prayer flicking, precise positioning, and a deep understanding of NPC pathing. 9. Defense Matters (Bandos) Many might question Bandos' inclusion in the list of hardest combat achievements, but the Defense Matters challenge is no joke. To complete this task, you must kill General Graardor twice in a row without taking any damage from his minions. Sounds simple? Think again. The minions spawn simultaneously, and you'll need to execute near-perfect prayer flicking on tick-perfect timing to prevent any damage. The trick is in managing your positioning and off-ticking the minions, making sure you're always on the move and prepared to deal with Bandos' own attacks. It's a test of mental focus and mechanical skill, and if you miss just one tick, you'll be sent back to the drawing board. 8. Five and Six Jads No one enjoys dealing with Jads, but the Five and Six Jads achievement takes this challenge to the next level. In this task, you're required to face off against five Jads (a difficulty that many find harder than six) back-to-back without a single death. The key here is to maintain flawless prayer switching and movement while dealing with the added complexity of healers. Mastering the tick system is essential-each Jad attack requires rapid prayer switches, and you need to avoid the stutter in the middle that throws off your rhythm. For newer players, this challenge is overwhelming, and even experienced players will find themselves caught off-guard. It's a brutal test of focus, but for those who can master it, the rewards are well worth the effort. 7. Perfect Wardens (Tombs of Amascut) In Tombs of Amascut, the Perfect Wardens achievement requires you to complete the wardens phase at a raid level of 300 or higher with all invocations active. Every move counts-one mistake, and you'll be sent back to the beginning. The difficulty is amplified by the fact that you can't take any avoidable damage during this phase, making every tick and prayer flick critical. The pressure mounts as you approach the final phase, where a single error means that all of the effort you've invested up to that point is wasted. The Tombs of Amascut raid has pushed the skill ceiling higher, and Perfect Wardens is one of the toughest tests for any combat player. 6. Reinforcements (Coliseum) Moving on to the Reinforcements achievement in the Colosseum, you need to complete a particularly punishing set of waves under the worst conditions. The goal is to defeat a set number of waves while dealing with modifiers that add new layers of difficulty, such as enemies that constantly hone in on your position. As you complete wave after wave, you'll encounter 47 NPCs at once, forcing you to juggle mechanics and keep your wits sharp. If you make a mistake here, it's back to the start, and it doesn't help that the boss phase, Soul Herodit, is also a formidable challenge. Mental acuity is just as important as mechanical skill here, as you'll need to stay focused for extended periods, solving puzzles and tracking patterns across several waves. 5. Inferno Speedrunner Speedrunning the Inferno is not for the faint of heart. To achieve this combat task, you need to complete the Inferno in under 65 minutes-a tall order for anyone. Speedrunning the Inferno requires you to know the encounter like the back of your hand. You must be fast and efficient with your solutions to each wave, balancing your combat abilities, positioning, and timing. The constant need to move quickly means you'll be forced to take risks and make split-second decisions. While power creep has made it a bit easier (thanks to gear like the twisted bow and prayer-flask potions), the sheer difficulty of the task means that only the best players can succeed consistently. 4. Perfection of Head (Tombs of Amascut) The Perfection of Head achievement is the hardest challenge in the Tombs of Amascut, and for good reason. This task requires you to complete the entire raid with every invocation on, all while dealing with the memory puzzle, orb phases, and the unforgiving mechanics of expert mode. The key challenge here is that all of the invocations add additional hazards that make keeping your focus and coordination critical. This combat achievement tests both physical skill and mental stamina as you work through each phase, trying to avoid any hits and keep the entire team in sync. 3. Perfect Theater (Theater of Blood) The Theater of Blood is one of RuneScape's most infamous raids, and the Perfect Theater combat achievement requires you to complete the raid while taking zero avoidable damage. You'll need to execute every mechanic perfectly, from ensuring no crab enters Maiden's room to making sure you attack Nyakas with the correct style. After breezing through the first few rooms, you'll be hit with the overwhelming challenge that is Zarpus, followed by the punishing difficulty of Verszik. A single mistake here could mean hours of work wasted, making Perfect Theater one of the hardest challenges in the game. 2. Inferno Without Losing 50 HP The second most difficult combat achievement in Old School RuneScape is the ultimate test of skill in the Inferno: completing the entire encounter without ever dropping below 50 HP. One mistake-whether it's a missed prayer switch or a bad flick-and you'll be starting over from the beginning. This challenge demands absolute perfection, and the mental fortitude to handle the extended encounter without any errors. It's one of the most difficult and rewarding feats in the game, requiring you to be at the top of your game from start to finish. 1. Blood Torva (Desert Treasure II) And finally, the hardest combat achievement in Old School RuneScape: Blood Torva. This achievement requires you to defeat all four Desert Treasure II bosses in their awakened forms. To succeed, you'll need to manage multiple prayer switches against various attack styles and avoid making any mistakes during the extremely challenging encounter. Each boss brings new mechanics to master, and the mental and physical strain required to complete this achievement is immense. There's no doubt that Blood Torva is the pinnacle of RuneScape's combat achievements, and achieving it is the ultimate testament to a player's skill. Conclusion Achieving Grandmaster status in Old School RuneScape has never been an easy feat. While power creep and boosting methods have made some of the challenges more accessible, the true test of skill still lies in mastering the hardest combat achievements. Whether you're tackling the Inferno or the Theater of Blood, each of these tasks requires a perfect blend of mechanical skill, game knowledge, and focus. The path to Grandmaster may be easier now RuneScape gold, but for those willing to put in the time and effort, the rewards are more than worth it.