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