Return to Sender Achievements Here is the full list of all 19 Return to Sender 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 TinkererPurchase 5 peashooter upgrades as Stuart Absolute StuartComplete all special runs with Stuart Absolute MorrisComplete all special runs with Morris Absolute GuntherComplete all special runs with Gunther Absolute BrutusComplete all special runs with Brutus Absolute HumphreyComplete all special runs with Humphrey Absolute GemComplete all special runs with each character Honourable DischargeDefeat Commander Cacti Fish BonesDefeat Chum Third Degree BurnsDefeat Hothead River WrestlerDefeat Croc n' Ball ConquerorDefeat the final boss Dimension HopperReach the Lower World Pound of fleshCompletely use an altar and be left with less than 5 HP Fly SwatterKill 5 or more flies at once using the Fuzzy Socks Parry PongKill a nomad by Parrying one of their parrying shots GuntherUnlock Gunther HumphreyUnlock Humphrey The RegularBuy 25 items from the item shop