Here is the full list of all 41 Infinite Air with Mark McMorris achievements.
Accumulate a total of 10 minutes of hang time.
Land 3 different tricks perfectly in a row.
Land a 1440 Triple Cork.
Publish your first replay from Free Ride.
Perform 200 aerial tricks.
Fly the helicopter a total of 50 miles.
Complete your first run.
Complete any Backcountry run.
Customize your gear.
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.
Create and publish a Big Air run.
Create and publish a Halfpipe run.
Create and publish a Slopestyle run.
Perform 100 rail tricks.
Land a 1800 Quadruple cork.
Do 2 different grabs in one trick.
Land 7 different tricks perfectly in a row.
Grind for a cumulative total of 1 minute.
Complete 50 different runs.
Complete the same run 10 times.
Play every run type.
Unlock an item on the Circuit.
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.