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