Make sure to buy your old DLCs just in case they get delisted!
Complete wave 30 on Survival: Settlement. - Iron Brigade
Complete wave 20 on Survival: Swamp. - Iron Brigade
Defeat the Martian Bear. - Iron Brigade
583/583250/25023/23
2,941/2,9411,250/1,25054/54
974/1,580735/1,00030/44