Alien Grounds Achievements Here is the full list of all 13 Alien Grounds achievements.Filter Achievement View View Image viewList view Sort by TrueSteamAchievement desc TrueSteamAchievement asc Achievement name desc Achievement name asc TSA Ratio desc TSA Ratio asc Gamers desc Gamers asc Steam order Date won desc Date won asc What are achievement flags? Click to find outApply Hard 10Complete Mission #10 on Hard difficulty. Hard 30Complete Mission #30 on Hard difficulty. Hard 100Complete Mission #100 on Hard difficulty. Hard 1 BlitzComplete Mission #1 on Hard difficulty within 1 minute. Easy OffMake 3 enemies fall off the map in a single Easy Mission. All OffMake every enemy fall off the map in a single Mission. Hard 300Complete Mission #300 on Hard difficulty. Hard 1000Complete Mission #1000 on Hard difficulty. All FireballsShoot down all fireballs in a single Mission. All HeadshotsEliminate all enemies with headshots in a single Mission. Hard AccuracyComplete a Hard Mission without missing a single shot. Easy AccuracyComplete an Easy Mission without missing a single shot. Medium AccuracyComplete a Medium Mission without missing a single shot.