Here is the full list of all 16 Escape Goat 2 achievements.
Beat 4-2 destroying all reapers
Beat 3-1 destroying all reapers
Exit 2-6 with 3 wooden crates remaining
Beat game in under 30 minutes without loading from save
Release 16 sheep soul orbs
Find one secret room
Find all secret rooms
Beat one secret room
Beat all secret rooms
Beat 4-2 without harming any reapers
Beat 4-6 without obtaining the Magic Hat
Beat 5-6 without destroying any wooden crates
Beat 5-8 destroying all reapers
Beat 7-1 with at least 6 reapers unharmed
Beat 8-6 without obtaining the Magic Hat
Beat 8-8 without breaking the lower bones