Complete the indicated task to unlock the achievement.

Achievement	How to unlock
1621	Find all hidden Backer messages.
4WD	Unlock a fourth bike.
Bikeopath	Complete all expert challenges.
Born to ride!	Complete all challenges on Graterhorn.
Can you ever have enough bikes?	Unlock a sixth bike.
Do it like Jason!	Jump 15 Meters.
Drop it like it's rock!	Complete all challenges on Sierra Rivera.
Falling is like flying 99% of the time	Fall 20 Meters.
Fashion Victim	Unlock all outfits.
Free Rider	Cross all finish lines on Free Ride.
From Rock to Rock	Unlock Mount Riley.
Gravity	Cross all finish lines with Geronimo.
Highlander	Crash against a rock, a tree, a cactus and into the water.
I hope the bike is okay!	Hit 1 tree and go swimming afterwards.
Indian Summer Ride	Unlock Redmoor Peaks.
It's all Downhill from here	Cross your first finish line.
Jack of all Trails	Cross all finish lines with Grasshopper.
Just Trailing	Complete all beginner challenges.
King of Bikes and Master of Mountains	Cross all finish lines with all bikes.
Like a Gazelle	Cross all finish lines with Pacebraker.
Lonely Places	Find all resting places on Mount Riley.
Lycra Runner	Cross all finish lines with Javelin.
Maybe try a boat?	Go swimming 50 times.
Message in a tree	Find your first Backer message.
Moments > Segments	Find all resting places on Sierra Rivera.
N+1	Unlock a second bike.
No brakes, high stakes!	Ride 1000 meters without braking.
No ride like a night ride	Unlock a night ride.
Now we're a familiy!	Unlock a third bike.
Off the beaten tracks	Cross all finish lines with Trailblazer.
Offroad King	Cross all finish lines with Boar.
Peace and Quiet	Find all resting places on Remoor Peaks.
Ride Forest! Ride!	Ride a trail without crashing.
Ride it like you stole it	Reach a Top Speed of 100 Km/H or 62 M/h.
Riding High	Unlock Sierra Rivera.
Riding in Style	Unlock all paint jobs.
Rolling, Rolling, Rolling!	Ride 750 meters without pedaling.
Sdrawkcab!	Sdrawkcab sretem 001 ediR.
Spikey Bikey!	Hit cactuses 100 times.
Sticks and Stones do break your bones!	Hit 1 tree and 1 rock in one crash.
Stop and Smell the Brakes	Find one resting place.
That needs a bandage	Hit 3 rocks in one crash.
The Legend of the Fall	Complete all challenges on Redmoor Peaks.
The Ride is Dark and Full of Terrors	Cross all finish lines on the free night mode.
The Rocky Mountain Rider Show	Complete all challenges on Mount Riley.
Top of the World	Find all resting places on Graterhorn.
Tree Hugger	Hit trees 500 times.
Welcome to the Ride Club	Unlock a fifth bike.
Who pays all the hospital bills?	Hit 2 trees in one crash.
You Rock!	Hit rocks 1000 times.