Here is the full list of all 41 Infinite Air with Mark McMorris achievements.
Complete any tutorial lesson.
Land 3 different tricks perfectly in a row.
Complete the same run 10 times.
Accumulate a total of 10 minutes of hang time.
Perform 200 aerial tricks.
Complete any Slopestyle run.
Unlock the second tier in Circuit Mode.
Score 90 or better on a Big Air competition.
Unlock an item on the Circuit.
Complete any Big Air run.
Land a 1800 Quadruple cork.
Complete any Backcountry run.
Do 2 different grabs in one trick.
Complete your first run.
Complete any Halfpipe run.
Land a 1440 Triple Cork.
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.
Fly the helicopter a total of 50 miles.
Complete 50 different runs.
Play every run type.
Customize your gear.
Unlock all playable characters.
Score 90 or better on a Slopestyle competition.
Score 90 or better on a Halfpipe competition.
Score over 9000 on a Backcountry run or in Free Ride.