Here is the full list of all 41 Infinite Air with Mark McMorris achievements.
Live Ride with another player.
Achieve all of the possible points in Circuit Mode.
Beat Mark McMorris at his own game.
Win 25 competitions.
Score 90 or better on a Slopestyle competition.
Score 90 or better on a Halfpipe competition.
Complete 50 different runs.
Win your first competition.
Win 5 competitions.
Land 7 different tricks perfectly in a row.
Unlock the final tier in Circuit Mode.
Unlock all playable characters.
Unlock the fifth tier in Circuit Mode.
Unlock the fourth tier in Circuit Mode.
Grind for a cumulative total of 1 minute.
Perform 100 rail tricks.
Fly the helicopter a total of 50 miles.
Complete the same run 10 times.
Unlock the third tier in Circuit Mode.
Score over 9000 on a Backcountry run or in Free Ride.
Land a 1440 Triple Cork.
Land a 1800 Quadruple cork.
Perform 200 aerial tricks.
Create and publish a Big Air run.
Create and publish a Halfpipe run.
Create and publish a Slopestyle run.
Publish your first replay from Free Ride.
Accumulate a total of 10 minutes of hang time.
Unlock the second tier in Circuit Mode.
Play every run type.
Complete any Halfpipe run.
Customize your gear.
Score 90 or better on a Big Air competition.
Complete any Slopestyle run.
Complete any Big Air run.
Complete your first run.
Complete any Backcountry run.
Unlock an item on the Circuit.
Land 3 different tricks perfectly in a row.
Do 2 different grabs in one trick.
Complete any tutorial lesson.