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