Here is the full list of all 27 Gear Up achievements.
Recieve 500 damage without being destroyed in a round.
Repair 30000 armor in lifetime.
Repair (1250) armor in one round of a team game mode.
Win a TDM round overwhelmingly, with a ratio of 4:1 or higher.
Capture a conquest tower together with 3 or more teammates.
Killed a deserting enemy
Destroy 20 enemies with the Grayhound (saws).
Destroy at least seven different opponents in a team game mode.
Destroy 25 enemies
Back playing after more than one week of Gear Up absence.
Win 3 conquest rounds.
10 kills in a row
Destroy 10 enemies with the default starter cannon.
6 kills in a row
4 kills in a row
3 kills in a row
2 kills in a row
Win a Conquest round overwhelmingly, with a ratio of 4:1 or higher.
Assist in capturing at least 20 conquest towers in a single round.
Drown in the water at least once.
Destroy 50 enemies
Destroy 75 enemies
Destroy 100 enemies
Destroy 1500 enemies
Win 20 deathmatch rounds.
Win 20 team deathmatch rounds.
Win 20 conquest rounds.