Here is the full list of all 20 Microsoft Treasure Hunt (Windows 8) achievements worth 200 gamerscore.
Reached the exit on level 11 without using any flags
Reached level 12 without dying or respawning
Entered a shop with at least 500 gold and spent down to exactly 0 before you leave
Defeated 3 monsters
Dug all dirt tiles without traps on any level
Triggered your first trap
Collected 1000 gold in bonus levels
Reached the exit on level 1
Purchase the 8 Dynamite Bag
Purchase the 10 Pickaxe Belt
Purchase the 15 Map Tube
Purchase 3 Amulets in one game
Have 5 hearts
Gather 5000000 gold
Use a dynamite 8 times during one level
Use a map 20 times
Defeat 5 bats without defeating any other monsters in-between
Dig 1000 dirt tiles by "chording" (placing flags on nearby traps and tapping the adjacent tiles)
Reach level 3 without picking up any gold or treasure
Purchase all item and heart upgrades for your character