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