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