Here is the full list of all 70 Sleep Attack achievements.
Beat one level in less than 5 minutes.
Earn 12 stars.
Earn 36 stars.
Earn 72 stars.
Complete World 1 in 6 hours.
Complete World 3 in 9 hours.
Complete World 6 in 12 hours.
Play once a week for 3 months.
Defeat 5000 Half Step.
Defeat 3000 Half Step.
Defeat 1500 Half Step.
Defeat 4000 Short Step.
Defeat 2500 Short Step.
Defeat 1000 Short Step.
Defeat 1000 Big Foot.
Defeat 500 Big Foot.
Defeat 250 Big Foot.
Defeat 100 Heavy Foot.
Defeat 75 Heavy Foot.
Defeat 50 Heavy Foot.
Defeat 1000 Pigdogs.
Defeat 600 Pigdogs.
Defeat 400 Pigdogs.
Defeat 100 Boardogs.
Defeat 80 Boardogs.
Defeat 60 Boardogs.
Defeat 1500 Yaks.
Defeat 1000 Yaks.
Defeat 500 Yaks.
Defeat 300 Big Yaks.
Defeat 200 Big Yaks.
Defeat 150 Big Yaks.
Defeat 500 Tiny Wings.
Defeat 350 Tiny Wings.
Defeat 250 Tiny Wings.
Defeat 150 Angry Birds.
Defeat 100 Angry Birds.
Defeat 50 Angry Birds.
Defeat 500 Mosquitos.
Defeat 300 Mosquitos.
Defeat 200 Mosquitos.
Defeat 200 Tiger Mosquitos.
Defeat 100 Tiger Mosquitos.
Defeat 50 Tiger Mosquitos.
Defeat 50 Iron Shells.
Defeat 25 Iron Shells.
Defeat 10 Iron Shells.
Defeat 100 Shell Reactors.
Defeat 50 Shell Reactors.
Defeat 25 Shell Reactors.
Beat 2 levels using only the Basic Tower. The first level doesn't count.
Beat 1 level using only the Power Shooter.
Beat 1 level using only the Wave Generator.
Beat 2 levels without using any Slow Towers.
Beat 1 level using only the Laser Towers.
Kill 200 enemies in 3 minutes.
Use 10 power-ups Rewind.
Use 10 power-ups Freezing Power.
Use 10 power-ups Good Night.
Use 10 power-ups Level Up.
Use 10 power-ups Centrifuge.
Complete 1 level without building towers. Remember, you have power-ups!
Catch 150 jellyfishes.
Collect 2000 coins left by defeated enemies.
Make 30 combos in 1 level.
Defeat 20 enemies in 1 combo.
Earn 30000 sleeping beans in 1 level.
Kill 30 enemies using one Toxic Fart power-up.
Kill 50 enemies using one Toxic Fart power-up.
Complete 1 level skipping all the waves.