Here is the full list of all 37 Voxelgram achievements. It takes around 30-35 hours to unlock all of the achievements on Windows.
Solve 100 puzzles
Finish diorama "Farm"
Finish diorama "Sea"
Finish diorama "Insects"
Solve 50 puzzles
Finish diorama "Concert"
Finish diorama "Backyard"
Finish diorama "Chicken Coop"
Solve 25 puzzles
Solve 10 puzzles
Solve 40 puzzles
Solve 20 puzzles
Finish diorama "Throne Room"
Finish diorama "Dungeon"
Solve all Gym puzzles
Solve all Magician Workshop puzzles
Solve all Dining Room puzzles
Solve all Bedroom puzzles
Solve all Forest puzzles
Solve all Bathroom puzzles
Solve all Workshop puzzles
Solve all Beach puzzles
Solve all Art Gallery puzzles
Solve all Picnic puzzles
Solve all Santa Workshop puzzles
Solve all Siege puzzles
Solve all Board Games puzzles
Solve all Kitchen puzzles
Solve all Breakfast Restaurant puzzles
Solve all Prototype puzzles
Solve all Garden puzzles
Solve all Tutorial puzzles