Here is the full list of all 36 Zombie Builder Defense 2 achievements.
Complete Act 1 on Easy
Complete Act 1 on Normal
Complete Act 1 on Hard
Complete Act 2 on Easy
Complete Act 2 on Normal
Complete Act 2 on Hard
Complete Act 3 on Easy
Complete Act 3 on Normal
Complete Act 3 on Hard
Complete Act 4 on Easy
Complete Act 4 on Normal
Complete Act 4 on Hard
Complete Act 5 on Easy
Complete Act 5 on Nroaml
Complete Act 5 on Hard
Complete Act 6 on Easy
Complete Act 6 on Normal
Complete Act 6 on Hard
Max all Pistols
Max all SMGs
Max all Shotuns
Max all ARs
Max all LMGs
Max all Snipers
Barter
Reach the Max Rank
Complete Act 1 on One Shot In Hell
Complete Act 2 on One Shot In Hell
Complete Act 3 on One Shot In Hell
Complete Act 4 on One Shot In Hell
Complete Act 5 on One Shot In Hell
Complete Act 6 on One Shot In Hell
Survive Past Wave 10 in Endless
Survive Past Wave 20 in Endless
Survive Past Wave 30 in Endless