Here is the full list of all 19 Aftercharge achievements.
Win 50 games
Reach level 30
Revive two allies while your Speed Boost is active
Shoot a tracked disabled workonic and reveal his two allies
Imprison two disabled workonics with three walls
Take down a workonic stuck in your trap
Take down a workonic tracked by an ally who's out of energy
Win a round as workonics while your team is affected by Orbital Strikes
Break 20 extractors
Deliver the last hit on the last extractor while being the last remaining workonic
Use your Invincibility to save an ally from being shot down
Take down 50 workonics
Hit three workonics with the same Air Strike
Destroy 8 devices with a single Pulse Barrage
Take down a workonic while airborne
Blind two enforcers simultaneously
Imprison two enforcers in your Protective Shield
Take down a stealth workonic with your weapon
Complete both tutorials