Alien Hallway 2 Achievements Here is the full list of all 22 Alien Hallway 2 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 Kill 1000 aliens.Kill 1000 aliens. Kill 50000 aliens.Kill 50000 aliens. Kill 500000 aliens.Kill 500000 aliens. Collect 5000 crystals.Collect 5000 crystals. Collect 50000 crystals.Collect 50000 crystals. Collect 500000 crystals.Collect 500000 crystals. Kill 1000 aliens by barrel explode.Kill 1000 aliens by barrel explode. Complite 10 additional missions.Complite 10 additional missions. Complite 50 additional missions.Complite 50 additional missions. Earn 25 stars.Earn 25 stars. Earn 50 stars.Earn 50 stars. Collect 30000 coins.Collect 30000 coins. Collect 100000 coins.Collect 100000 coins. Collect 3500000 coins.Collect 3500000 coins. Kill 20 bosses on easy level.Kill 20 bosses on easy level. Kill 20 bosses on hard level.Kill 20 bosses on hard level. Kill boss Kraken on hard level.Kill boss Kraken on hard level. Upgrade any soldiers 10 timesUpgrade any soldiers 10 times Upgrade soldier to maximum.Upgrade soldier to maximum. Upgrade all soldiers to maximum.Upgrade all soldiers to maximum. Destroy 500 small boxesDestroy 500 small boxes Destroy 1000 big boxes.Destroy 1000 big boxes.