Here is the full list of all 33 Pixel Puzzles 2: Birds achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Complete Puzzle 8
Complete Puzzle 19
Complete Puzzle 16
Complete Puzzle 12
Complete Puzzle 18
Complete Puzzle 5
Complete Puzzle 1
Complete Puzzle 15
Complete Puzzle 6
Complete Puzzle 13
Complete Puzzle 10
Complete Puzzle 7
Complete Puzzle 9
Complete Puzzle 2
Drob 100 crabs in 1 session
Complete Puzzle 4
Complete Puzzle 3
Use location power
Use Rotation power
Use ghost power
Remove the crabs
Drop a crab in the net
Complete DL-TV Puzzle
Complete Puzzle 11
Complete Puzzle 14
Complete Puzzle 17
Complete Puzzle 20
Complete Puzzle 21
Complete Puzzle 22
Complete Puzzle 23
Complete Puzzle 24
Complete Puzzle 25
Complete All Puzzle