Here is the full list of all 12 Midair 2 Playtest achievements.
First enemy fragged
Fragged 50 enemies
Fragged 100 enemies
Fragged 250 enemies
First frag assist
50 frag assists
100 frag assists
250 frag assists
First Tempest frag
50 Tempest frags
100 Tempest frags
250 Tempest frags