Here is the full list of all 38 Gearshifters achievements.
Destroy the Sawdozer.
Complete a Frontier Province stage.
Equip a secondary weapon.
Equip your car with an upgrade.
Destroy the Combustor.
Complete a Primary Sector stage.
All other trophies unlocked.
Complete a South Uplands stage.
Complete a Shadow Quarter stage.
Complete an Ochre Wastes stage.
Complete a Dark Haven stage.
Complete a Sentry Ranges stage.
Complete a Northern Expanse stage.
Complete a Citadel stage.
Destroy an enemy with a Powerslide attack.
Destroy an enemy with a Reverse attack.
Purchase 10 weapons.
Unlock 5 liveries.
Use 15 different boosts.
Purchase 10 charge abilities.
Destroy 50 enemy vehicles with melee attacks.
Acquire 20,000 currency.
Survive any stage without taking damage.
Destroy an Elite vehicle.
Defeat a faction.
Destroy all Elite vehicles.
Destroy the Juggernaut.
Destroy the Wrecker.
Destroy the Thunderer.
Destroy the Suncopter.
Destroy the Marauder.
Destroy the Spearhunter.
Destroy the Emissary.
Unlock all driving skills.
Defeat all factions.
Deliver 10 different cargoes.
Purchase all upgrades.
Game completed (Any mode).