Here is the full list of all 9 Tactris achievements.
The base game contains 0 achievements, and there is 1 DLC pack containing 9 achievements.
Complete the Tactris tutorial.
Complete ten waves in a row.
Complete one wave.
Eliminate 100 enemies.
Eliminate 1000 enemies.
Complete a rare, special wave.
Complete a special "H A R D" challenge.
Achieve an Epic combo.
Remove a formation containing 10 units from the board.