Here is the full list of all 26 DETOUR achievements.
Beat the first tier of Singleplayer Challenges. (9 / 27) Unlocks the "Brick" Truck Theme.
Win an online 1v1 game without losing a single building, and destroy 10 of your opponent's buildings.
Win a 4-player online game without having any of your trucks stopped, and have all trucks cross the finish line at max speed. (Must be 10 trucks to win) Unlocks the "Hot Rod" Truck Theme.
Win an online 4-player multiplayer game after destroying 9 enemy trucks.
Win an online 4-player multiplayer game after destroying 14 enemy trucks. Unlocks the "Undead" Truck Theme.
Score with a truck that has hit one pile of nails in an online multiplayer game.
Score 3 trucks in a single online multiplayer game after they have hit nails.
Destroy 15 enemy structures with a single ground turret in an online multiplayer game.
Win an online multiplayer game after shooting down 5 enemy bombs and without losing a single truck to enemy bombs. Unlocks the "Medieval" Truck Theme.
In a 4-player online game, destroy an enemy truck with a direct hit while 3 enemy air turrets are in play. Unlocks the "Camo" Truck Theme.
Land a direct hit on an enemy air turret before it turns around.
Destroy an enemy truck 15 seconds into an online multiplayer game. Unlocks the "Carnival" Truck Theme.
In an online multiplayer game, score a truck that was under the cover of a Scanner Tower when your opponent initiated a scan. Unlocks the "Aquarium" Truck Theme.
Score with a truck your opponent could see the whole time in an online multiplayer 1v1 game.
Contest the same mine three times in a single online multiplayer game.
Survive 10 consecutive stages on Survival mode.
Survive 10 consecutive rounds on Tower Defense.
Log 24 hours of playtime.
Win a game against an Unyielding computer opponent on one of the default maps without causing any explosions. (No Turrets besides Scanner Towers) Unlocks the "Girly" Truck Theme.
Make three trucks with maximum speed upgrade drive by a Donut Shop in any online multiplayer game mode. Unlocks the "Hippy" Truck Theme.
Defeat three Unyielding AI opponents in a 1v3 match on the official map; Crossroads.
In an online multiplayer game, launch a truck first thing, and then score a point with it.
Win Challenge 27 without claiming the gold mines. Unlocks the "Holy" Truck Theme.
Destroy 500 forest tiles throughout your career. Unlocks the "Evil" Truck Theme.
Beat the second tier of Singleplayer Challenges. (18 / 27) Unlocks the "Toxic" Truck Theme.
Beat the third tier of Singleplayer Challenges. (27 / 27) Unlocks the "DETOUR" Truck Theme.