Here is the full list of all 16 Ducks and Gooobers achievements.
Pass the Castle map on any difficulty.
Pass the Desert map on any difficulty.
Pass the Snow map on any difficulty.
Pass the Rocky Road map on any difficulty.
Pass the Magma map on any difficulty.
Pass the Mountain map on any difficulty.
Pass the Beach map on any difficulty.
Pass the Stoplight map on any difficulty.
Pass the Ghostly Paths map on any difficulty.
Pass the Castle map only using the Medieval Tower
Pass the Rocky Road map only using the Shotgun Turret
Pass the Snow map only using the Ice Tower.
Pass the Mountain map only using the Sniper Tower.
Pass any map only using Tendie Fryers
Pass any map only using Ketchup Towers
Pass any map using every tower.