Here is the full list of all 51 Skydive: Proximity Flight trophies - there are 44 bronze, 3 silver, 3 gold and 1 platinum.
Win 3 freestyle flights in 'Beat the Best' mode
Get 3 stars at all of start points of Grand Canyon
Perform at least 3x proximity flight for 15 seconds in a row
Get 3 stars at all of start points of Switzerland
Get 3 stars at all of start points of Italy
Get 3 stars at all of start points of Halong Bay
Win any race without using rewind
Perform 10 proximity backflips in a row
Run game after one month after the first start
Perform 16 different tricks during one flight then land successfully
Perform 2 pinholes in one flight
Land a vampire in the castle
Win race in Ice Ridge
Finish a flight in 'Beat the Best' mode
Jump from all of start points
Win race in Eagle Mountain
Perform proximity flight for 25 seconds in a row
Land squirrel in the forest
One hour of flight time
Perform 5 proximity rolls in a row
Complete all basic challenges
Successfully land on water
Complete all routes
Complete at least 10 challenges with 2 stars
Perform 3 backflips in a row
Perform 10 bad starts in a row (fail race, get no stars for free flight)
Perform perfect landing
Perform chain of 5 different tricks
Perform proximity dive and spin
Get 5000 score for proximity dive
Perform chain of 3 different tricks
Perform proximity backflip
Perform 3 barrel rolls in a row
Perform proximity roll
Perform 5 bad starts in a row (fail race, get no stars for free flight)
Perform under ceiling flight
Perform successful landing
Complete at least one challenge with 3 stars
Perform 5 different tricks in one time
Get 2000 score for flying near trees
Perform 4 different tricks in one time
Unlock all other trophies
Perform at least 5x proximity flight for 7 seconds in a row
Get 100k score for proximity flight in a row
Win 3 races in 'Beat The Best' or 'Beat Friend' mode
Complete all challenges with 3 stars (excluding extra challenges)
Complete all advanced challenges
Complete 'Trick Mix' challenge
Fly all characters
Win race in Death Valley
Win race in Monkey Gorge