Here is the full list of all 36 Thunder Tier One Playtest achievements.
First kill assist
First death
First confirmed kill
First teammate revive
100 confirmed kills
1000 confirmed kills
2500 confirmed kills
5000 confirmed kills
50 teammates revived
100 teammates revived
250 teammates revived
500 teammates revived
100 total assists
250 total assists
500 total assists
1000 total assists
100 total deaths
1000 total deaths
2500 total deaths
5000 total deaths
1000 total shots fired
10,000 total shots fired
100,000 total shots fired
250,000 total shots fired
500,000 total shots fired
Completed the campaign
100% Campaign completion!
Failed the same mission 10 times in a row
Died without dealing any damage to the enemy
Reached maximum carry weight
Killed a teammate
Killed by friendly fire
Restrained 100 enemies
Completed training
Destroyed x lights
Mission completed without any knocks or deaths on Realism