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