Galactic Garrison Achievements Here is the full list of all 26 Galactic Garrison 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 First ContactComplete your first wave Garrison CommanderReach wave 5 Wave RiderReach wave 10 Seasoned SurvivorReach wave 15 Defender of MarsReach wave 20 Galactic LegendReach wave 25 Novice BarricaderBuild 10 barricades Adept Barrier BuilderBuild 25 barricades Expert FortifierBuild 50 barricades Master of DefensesBuild 100 barricades Rookie RecruiterPlace 10 soldiers Skilled Squad LeaderPlace 25 soldiers Veteran CommanderPlace 50 soldiers Galactic GeneralPlace 100 soldiers Apprentice EngineerPlace 10 turrets Seasoned MechanicPlace 25 turrets Turret Tactics MasterPlace 50 turrets Supreme Weapons StrategistPlace 100 turrets Alien AnnihilatorDestroy 100 enemies Extraterrestrial ExterminatorDestroy 250 enemies Cosmic CleanerDestroy 500 enemies Galactic AnnihilationDestroy 1,000 enemies Card NoviceUse a card Card ApprenticeUse 5 cards Card MasterUse 10 cards Card SharkUse 20 cards