Here is the full list of all 31 Lemnis Gate achievements.
Make an opponent's operative kill themselves by deploying a shield in an online match
As Striker, inflict 3 headshots in one turn in an online match
Find all collectibles on one world
Find all collectibles on all worlds
Reach player Level 10
Reach player Level 50
Reach player Level 100
Play 100 online matches
Play 1000 online matches
Win 10 online matches
Win 50 online matches
Win 100 online matches
Reach mastery level 10 with one operative
Reach mastery level 10 with all operatives
Kill 2 enemy operatives in a row in an online match (10 times)
Kill 3 enemy operatives in a row in an online match (5 times)
Kill 5 enemy operatives in a single round in an online match
Kill 10 enemy operatives by proximity mine in online matches
Kill Deathblow by triggering his own proximity mine in an online match
Kill yourself using Deathblow's eradicator 10 times in online matches
Deposit 200 exotic matter canisters in online matches
Destroy 100 resistors in online matches
Capture 100 particle accelerators in online matches
Completely unlock one operative's default hex grid
Completely unlock all operatives' default hex grid
Complete all operative rooms in the training facility
Beat the challenge time in all drone time trials in training mode
Find the secret robot party in the tutorial
Capture all objectives, kill all enemies and keep your whole team alive in an online match
Fall off the map during a match
Kill an operative with an explosive barrel in an online match