
Accolades are recorded per map and per champion. If, for example, you achieve a new personal best for credit stomping or control point capturing, it'll be reflected with their relevant accolades.

Here are all of the accolades we've seen confirmed. Many more exist, such as credits earned, raider kills, and victory time.
Master Combatant: Champion kills
Triple Killer: Earn triple kills
Survivor: Only x deaths
Dooooooooom!: Doomsday Device fired x times
Deep Pockets: Credits earned
Turret Terror: Turrets destroyed
Power Relay Pro: Power Relay captures
Big Creature Hunter: Creature kills
Objective Obsession: Credits from objectives
Awesome Attacker: Attack Damage done to champions
Master Blaster: Power Damage done to champions

Accolade icons:

Finally, a few more details about changes coming with the new March update have been revealed.
The Recycle keyword is changing from being a mod to being baseline on Nil artifacts. Upon auto-attacking a drone under 20% health, the drone will be immediately destroyed.
The queue timer has been switched to a rolling queue timer which counts down instead of up, and will apply an incrementing merit bonus (up to 25%) to the next match based on wait time.
Matchmaking streaks, rewarding players for not dodging or quitting out of matches, will also award merit bonuses of up to 25%.
Champions will have separate default amplifier sets for each map, maximising their effectiveness per map.