Here is the full list of all 25 The Deadly Tower of Monsters achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Complete all other achievements
Destroy 25 target boards
Find the castaway ape
Find 6 missing film reels
Max out 3 projectile weapons
Reach the captain of the ghost pirate ship
Remove 5 apes with watches from the set
Max out 3 melee weapons
Fly through 50 hoops
Complete 18 waves in survival mode
Defeat the gigantic mutant octopus
Destroy 10 target boards
Destroy Dr. Schopenstein's replicator
Destroy all the mutant dinosaur eggs
Defeat the Mechameleon
Parry 20 enemy attacks
Kill 3 enemies with one landmine
Kill 3 enemies with parried projectiles
Fly through 20 hoops
Defeat the Mega-Gorilla
Conquer the Nukular ant hive
Kill a large dinosaur with a dagger
Kill 10 enemies by jumping on them
Guide 10 enemies into flaming turrets
Rescue Dick from the Mega-Gorilla