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