Here is the full list of all 12 Placement achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Spend more than 10 minutes on a level.
Complete 20 levels.
Complete 10 levels.
Learn the rules of the game.
Complete 40 levels.
Complete 60 levels.
Complete all levels.
On level 58, place all pieces on the board without protecting any.
Complete level 52 without using the top row.
Complete level 53 without using the middle row.
Complete level 55 without using the bottom row.
Move 534 pieces.