Here is the full list of all 53 Boulder Dash - there are 30th Anniversary achievements.
Complete all Bouldering Comp caves with a 3-star Rating
Complete Bouldering Comp Caves
Complete all Classic Remix caves with a 3-star Rating
Complete Classic Remix Caves
Unlock Bitford
Unlock Quartz
Complete all Boo caves with a 3-star Rating
Complete Boo Caves
Complete all Halloween caves with a 3-star Rating
Complete Halloween Caves
Complete all Critter Creek caves with a 3-star Rating
Complete Critter Creek Caves
Unlock Jade
Complete all Shades of Gray caves with a 3-star Rating
Complete Shades Of Gray Caves
Unlock Jet
Complete all Bit Box caves with a 3-star Rating
Complete Bit Box Caves
Unlock Classic Rockford
Complete all Oni Demons caves with a 3-star Rating
Complete Oni I'm Home Caves
Complete all Mine All Mine caves with a 3-star Rating
Complete Mine All Mine Caves
Clear all the dirt tiles in a level
Complete all Big Stone Dragon Caves with a 3-star Rating
Complete Big Stone Dragon Caves
Complete all Japanese Garden caves with a 3-star Rating
Complete Jade Garden Caves
Unlock Agate
Unlock Onyx
Complete all Boulder Mountain caves with a 3-star Rating
Complete Boulder Mountain Caves
Use the SpyGlass Power-up 20 times
Use the 2x Power-up 20 times
Use the Freeze Power-up 20 times
Use the Dynamite Power-up 20 times
Get crushed by a falling gem in Hardcore mode
Complete all Intro caves with a 3-star Rating
Complete Intro Caves
Convert 50 Boulders to Gems using Magic Walls
Crush 50 creatures under falling boulders
Trap an Amoeba forcing it to turn into gems
Collect 1000 gems
Crush a creature with a rock falling more than 8 spaces
Unlock Crystal
Open 10 Treasure Chests
Collect 50 gems with the 2x power-up engaged
Get crushed by a falling boulder
Create and Play One Level in the Level Editor
Upload a level you've created to Steam Workshop
Download and play 5 community created levels from Steam Workshop
Make a level with more than 20 boulders in it
Give ratings to 5 Steam Workshop caves