Here is the full list of all 41 Infinite Air with Mark McMorris achievements.
Complete any Halfpipe run.
Land a 1800 Quadruple cork.
Do 2 different grabs in one trick.
Complete any tutorial lesson.
Fly the helicopter a total of 50 miles.
Land 3 different tricks perfectly in a row.
Perform 200 aerial tricks.
Accumulate a total of 10 minutes of hang time.
Complete any Backcountry run.
Unlock an item on the Circuit.
Land a 1440 Triple Cork.
Complete your first run.
Complete any Big Air run.
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 100 rail tricks.
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.
Customize your gear.
Unlock all playable characters.
Complete any Slopestyle 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.