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