Here is the full list of all 16 Escape Goat 2 achievements.
Release 16 sheep soul orbs
Exit 2-6 with 3 wooden crates remaining
Beat game in under 30 minutes without loading from save
Find one secret room
Find all secret rooms
Beat one secret room
Beat all secret rooms
Beat 3-1 destroying all reapers
Beat 4-2 destroying all reapers
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