Here is the full list of all 50 The Crew Motorfest achievements.
Destroy 3 vehicles in Demolition Royale in the same session
Transform into a monster truck twice in a single game of demolition royale
Complete a custom event with a Crew of 4 players
Complete 30 Challenges
Chain two bike backflips while in the air and use fast fav with a plane, before reaching the ground
Spend 24 Hours in The Crew Motorfest
Complete all three timelines on the Motorfest Main Stage
Win 5 custom events in the same session
Complete 20 Photo Ops
Win by completing the event without hitting a wall, or track limits, driving in Ebisu Style
Stay still for 1 minute on the beach in front of the Royal Hawaiian Hotel
Complete 5 events in Main Stage Mode in the same session
Fly under 5 differents bridges in the same session
Perform 31 Different Motorfest Feats
Reach 88 MPH (142 Km/h) with the Delorean DMC-12 and use the rewind feature
Reach Level 15
Complete a Speedtrap instance with a boat
Perform a donut move around the pineapple shop
Try to leave Hawaii (boat or plane) by reaching the limit of the map
Fly through the "Rule the Streets" inflatable donut with a plane
Perform a donut move in the Ubisoft logo
Chain a 15 actions combo with Dynamic Freestyle
Reach the summit of the volcano with a ground vehicle
Fly as high as possible
Complete 6 Playlists
Spend 1 Million Bucks in one purchase
Reach maximum level on one vehicle
Participate in a Grand Race event
Complete a Summit Contest event
Participate in a Demolition Royale event
Overtake 12 players in the Grand Race in the same session
Complete all activities of a Summit Contest
Equip your avatar with the casual tuxedo and drive an Aston martin car
Become a Motorfest Legend for the first time
Fully customize one vehicle (Visual parts and Livery)
Stay in a Car meet car for 10 seconds or more
Submit 1 vehicle to the Custom show
Use up the rewind feature fully 1 time
Complete 15 Motorfest Events
Vote for 5 cars in the Custom show in the same session
Take 3 photos in the same session
Complete a Playlist for the first time
Drive or Fly 5 Km in formation with a Crew member, in the same session
Find and open a Treasure
Join, or form a Crew
Complete your Motorfest welcome for the first time
Own 30 Vehicles
Own a vehicle in 10 different vehicle categories
Use the fast travel feature for the first time
Travel 40 Kilometers (25 miles) anywhere in Hawaii in the same session