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