Here is the full list of all 24 Jimmie Johnson's Anything with an Engine achievements worth 1,000 gamerscore.
Complete a 50 lap Endurance event
Complete 50 Events in Single Event mode (Regulation Rules)
Win a Single Event Race (Regulation rules) by climbing from last to first place in the final lap
Discover and traverse all Expert Shortcuts successfully
Win a Single Event Race (Regulation rules), without using the Pit Stop
Win a Duel without using any weapons in Career mode or Single Event (Regulation Rules)
Complete Career mode by playing all events on Rookie difficulty or higher
Build all vehicles in the Garage
Destroy an opponent's car in a Duel, in Career Mode or Single Event
Achieve a 10x Ram Combo
Build a new vehicle in the Garage
Win your first Endurance event, in Career Mode or Single Event (Regulation rules)
Discover and successfully traverse an Expert Shortcut
Win your first Time Attack event, in Career Mode or Single Event (Regulation rules)
Complete a Career Mode event
Complete Career mode by playing all events on Pro difficulty or higher
Complete Career mode by playing all events on All-Star difficulty
Destroy an opponent's car as the Chicken Bomb in a Multiplayer Survival event
Complete an online Multiplayer event
Complete a local Multiplayer event
Beat all Time Attack Events on All-Star difficulty in Single Event Mode (Regulation rules)
Use every Gotcha to successfully strike at Bot opponents
Earn all Badges in a Single Event Race (Regulation rules)
Win an online Ranked event playing as Jimmie Johnson