ACHIEVEMENT - HOW TO UNLOCK Gladiator (25 points) - Clear all Survival mode arenas. Survival of the Fittest (20 points) - Complete a Survival mode arena without losing a life. Iron Man (10 points) - Learn how to operate your walker and complete Bootcamp. Can't Touch This (30 points) - Complete an area in Katharsis without getting hit. Back to Retirement (20 points) - Defeat Julius Steelwell and save the world by destroying The Butler. Veteran (25 points) - Complete all areas on the hardest difficulty. Green Peace (10 points) - Don't push over any trees in Trespassers. Thunder Struck (10 points) - Destroy all lightning harvesters in Fog of War. Mine! Mine! Mine! (10 points) - Don't take any damage from sea mines in Tide of Battle. Second in Command (15 points) - Defeat General Brutus by destroying The Excavator. You Never Walk Alone (10 points) - Complete an area in co-op. Take it to the Max (15 points) - Fully upgrade your walker.