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