Here is the full list of all 76 Duet achievements.
The base game contains 66 achievements, and there is 1 DLC pack containing 10 achievements.
Beat "continuance" wave 1000.
Beat "continuance" wave 100.
Beat "continuance" wave 10.
Beat 100 daily challenges.
Beat all of "transcendence" without hitting a wall.
Beat all of "release" without hitting a wall.
Beat all of "integrity" without hitting a wall.
Beat all of "intimacy" without hitting a wall.
Beat all of "acceptance" without hitting a wall.
Beat all of "resilience" without hitting a wall.
Beat all of "perspective" without hitting a wall.
Beat five advanced daily challenges.
Beat all of "tension" without hitting a wall.
Beat all of "ambition" without hitting a wall.
Beat all of "anticipation" without hitting a wall.
Beat all of "initiative" without hitting a wall.
Beat all of "identity" without hitting a wall.
Beat all of "control" without hitting a wall.
Beat all of "understanding" without hitting a wall.
Beat all of "trust" without hitting a wall.
Beat all of "quickening" without hitting a wall.
Beat all of "revolution" without hitting a wall.
Earn at least 1500 in infinite mode.
Get at least 250 in infinite mode.
Get at least 750 in infinite mode.
Beat ten daily challenges.
Beat all of "hope" without hitting a wall.
Beat all of "depression" without hitting a wall.
Beat all of "guilt" without hitting a wall.
Beat all of "bargaining" without hitting a wall.
Beat all of "anger" without hitting a wall.
Beat "release".
Beat "perspective".
Beat "tension".
Beat "ambition".
Beat "anticipation".
Beat seven daily challenges in a row.
Beat "integrity".
Beat "intimacy".
Beat "initiative".
Beat "identity".
Beat "control".
Beat "understanding".
Beat "trust".
Beat all of "denial" without hitting a wall.
Beat "transcendence".
Beat "resilience".
Beat "quickening".
Beat three daily challenges in a row.
Beat "revolution".
Beat the game and watch the end sequence credits to the end.
Beat "acceptance".
Successfully navigate invisible blocks.
Beat "hope".
Beat all of "ignorance" without hitting a wall.
Beat one daily challenge.
Try the infinite mode.
Beat "depression".
Beat the first wave.
Successfully spin around a rotating block.
Fail 10 times in a wave before completing it.
Beat "ignorance".
Beat "denial".
Beat "anger".
Beat "bargaining".
Beat "guilt".
Beat all of "reintegration" without hitting a wall.
Beat all of "reunion" without hitting a wall.
Beat all of "resentment" without hitting a wall.
Beat all of "relief" without hitting a wall.
Beat "reintegration".
Beat "reunion".
Beat "resentment".
Beat all of "confusion" without hitting a wall.
Beat "relief".
Beat "confusion".