Here is the full list of all 42 Mark McMorris Infinite Air trophies - there are 24 bronze, 14 silver, 3 gold and 1 platinum.
Live Ride with another player.
Unlock the fourth tier in Circuit Mode.
Score 90 or better on a Slopestyle competition.
Score 90 or better on a Halfpipe competition.
Win 25 competitions.
Perform 100 rail tricks.
Score over 9000 on a Backcountry run or in Free Ride.
Grind for a cumulative total of 1 minute.
Complete 50 different runs.
Score 90 or better on a Big Air competition.
Unlock the third tier in Circuit Mode.
Unlock the second tier in Circuit Mode.
Complete the same run 10 times.
Land a 1440 Triple Cork.
Land a 1800 Quadruple cork.
Accumulate a total of 10 minutes of hang time.
Perform 200 aerial tricks.
Unlock an item on the Circuit.
Win 5 competitions.
Win your first competition.
Land 7 different tricks perfectly in a row.
Land 3 different tricks perfectly in a row.
Publish your first replay from Free Ride.
Create and publish a Halfpipe run.
Create and publish a Big Air run.
Create and publish a Slopestyle run.
Play every run type.
Complete any Halfpipe run.
Complete any Slopestyle run.
Complete any Big Air run.
Complete any Backcountry run.
Complete your first run.
Customize your gear.
Do 2 different grabs in one trick.
Complete any tutorial lesson.
Earn all other trophies in the game to unlock this platinum trophy.
Unlock the fifth tier in Circuit Mode.
Unlock the final tier in Circuit Mode.
Achieve all of the possible points in Circuit Mode.
Beat Mark McMorris at his own game.
Fly the helicopter a total of 50 miles.
Unlock all playable characters.