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