Retro Invasion Achievements Here is the full list of all 20 Retro Invasion 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 WelcomeStart the Game for the first time InvasionStart Invasion mode for the first time Pistol MasterShoot the Pistol for the first time Minigun MasterShoot the Minigun for the first time Shotgun MasterShoot the Shotgun for the first time Rocket Launcher MasterShoot the Rocket Launcher for the first time Uzi MasterShoot the Uzi for the first time CrosshairPlay with the Crosshair Oops i'm deadDie for the first time The Monster HarvestKill a Monster for the first time Fist MasterUse the Fist for the first time Axe MasterUse the Axe for the first time Invasion Easy MasterComplete Invasion Mode on Easy Invasion Medium MasterComplete Invasion Mode on Medium Invasion Hard MasterComplete Invasion Mode on Hard Invasion Ultra Hard MasterComplete Invasion Mode on Ultra Hard The Monster Harvest MasterKill 1,000 Monsters Campaign MasterFinish the campaign World SaviorFinish the campaign Invasion MasterFinish the Invasion