Here is the full list of all 28 Tumblestone achievements.
Win a Battle match against 3 Nightmare bots.
Complete the Story Mode.
Solve Puzzle 2-8 using 44 moves.
Get a score of 500 in Infinipuzzle.
Complete World 11.
Win a Tug of War match against 3 Nightmare bots.
Get a score of 333 in Heartbeat.
Get a score of 1,234 in Marathon.
Get a score of 333 in Infinipuzzle using a modifier.
Empty the board in Heartbeat.
Empty the board in Marathon.
Complete World 10.
Win an online Tug of War match.
Complete World 9.
Complete World 8.
Complete 25 quests.
Complete World 7.
Win an online Battle match.
Reach rank 25.
Complete World 6.
Complete World 5.
Complete World 4.
Complete World 3.
Complete World 2.
Win a Puzzle Race match using a modifier.
Solve a 3-star Practice Puzzle.
Win an online Puzzle Race match.
Complete World 1.