Here is the full list of all 41 Mark McMorris Infinite Air achievements worth 1,000 gamerscore.
Complete your first run.
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.
Complete all of Mark's challenges in Circuit Mode.
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.
Do 2 different grabs in one trick.
Land 3 different tricks perfectly in a row.
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 an item on the Circuit.
Customize your gear.
Unlock all playable characters.
Complete any Slopestyle run.
Complete any Big Air run.
Complete any Halfpipe run.
Complete any Backcountry run.
Score 90 or better in a Slopestyle competition.
Score 90 or better in a Big Air competition.
Score 90 or better in a Halfpipe competition.
Score 9,000+ on a Backcountry run or Free Ride.