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