Here is the full list of all 21 Gemini: Heroes Reborn achievements.
Sisters
Completed Temporal Loop
Dug Deeper
Best Friends Forever
Found What You Were Looking For
Escaped the Prison
Kill a dozen enemies via Deathtraps
Made it to the Elevator
Uncovered Alex
Package Delivered
Survived the Elevator Battle
Introduced to Mason
Learned Time Stop
You Died
Learned Telekinesis
Learned Time Scout and Time Shift
Finished the Opening Tutorial
TK Throw 1000 Things
Catch 10 Rockets
Find 30 Secrets