Here is the full list of all 16 Boulder Dash Deluxe achievements.
Complete all the sea caves.
Complete all the beach caves.
Complete all the palm forest caves.
Complete all the forest caves.
Complete all the rocks caves.
Complete all the mountains caves.
Complete all the castle caves.
Complete all the classic caves.
Unlock Rollzons!
Unlock CaveoScope!
Unlock Boldtimer!
Unlock ForagerXXL!
Unlock M5Milebender!
Unlock NgadaCoin!
Unlock MonngoRelic!
Unlock TimeTraveller!