Here is the full list of all 27 Stacks On Stacks (On Stacks) achievements.
Collect all stars in the game on normal difficulty or harder.
Collect all stars in the game on hard difficulty or harder.
Collect all stars in the game on insane difficulty
Collect all coins and stars in the game on normal difficulty or harder.
Collect all the coins and stars in the game on hard difficulty or harder.
Collect all the coins and stars in the game on insane difficulty.
Beat the game on any difficulty.
Build a tower up to 20 feet or meters in Endless Mode.
Build a tower up to 30 feet or meters in Endless Mode.
Reach Stage 5 in Stage Rush Mode.
Reach Stage 10 in Stage Rush Mode.
Clear a stage in campaign mode by topping a tower with a baby.
Answer five quiz questions correctly.
Beat the Sun Demon in 3 or less rounds of building and firing without losing any lives.
Complete a stage in campaign mode by using a gigantic resizable brick.
Don't allow any ghosts to pass through during "Invaders".
Block all fireballs during a dragon attack.
Collect all the rings during a sky dive.
Collect all ten coins during a collectathon.
Place 1,000 bricks.
Beat a stage in the campaign mode by using over 100 bricks.
Weigh a scale in campaign mode all the way down.
Beat every stage of The Ruins in campaign mode.
Beat every stage of The FactoLabo in campaign mode.
Beat every stage of The Forest in campaign mode.
Beat every stage of The Desert in campaign mode.
Beat every warp stage in campaign mode.