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 all levels.
Complete 60 levels.
On level 58, place all pieces on the board without protecting any.
Complete level 53 without using the middle row.
Complete level 55 without using the bottom row.
Complete level 52 without using the top row.
Complete 40 levels.
Move 534 pieces.
Complete 20 levels.
Complete 10 levels.
Learn the rules of the game.