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