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