Here is the full list of all 50 Pure achievements worth 1,000 gamerscore. It takes around 20-25 hours to unlock all of the achievements on Xbox 360.
Successfully unlock the 9th Stage.
Successfully unlock the 10th Stage.
Place first in all six events in Stage 8.
Place first in all six events in Stage 9.
Place first in all seven events in Stage 10.
Unlock and then fill all ATV slots in the garage.
During an event; perform a combo of at least 125,000 points.
Come first in every event in the Pure World Tour.
During an event; pull off a 1080 forward or backward rotation in a single jump.
Perform 8 different special tricks in a single World Tour event.
Use a class D engine to beat an opponent with a class A engine in a ranked match.
Come first in a online championship.
Place first in all five events in Stage 7.
Successfully unlock the 8th Stage.
Spend 150 seconds in the air and go on to win the event.
Place first in all five events in Stage 6.
Successfully unlock the 7th Stage.
Extend a Freestyle event past the third lap.
Place first in all five events in Stage 5.
Successfully unlock the 6th Stage.
During an event; perform a combo of at least 50,000 points.
Build five ATVs, each with a different engine.
Place first in all four events in Stage 4.
Successfully unlock the 5th Stage.
Place first in all four events in Stage 3.
Come first in 5 online events in a row.
Win a competitive Freestyle event with Fresh tricks only.
Come first in an online event.
Successfully unlock the 4th Stage.
Place first in all four events in Stage 2.
Hold down the accelerator for an entire competitive Race or Sprint event and finish in first place.
Lap another rider during an offline Sprint event.
Successfully unlock the 3rd Stage.
Complete a lap of a Race event in World Tour without dismounting.
Place first in all four events in Stage 1.
Complete a World Tour event without dismounting.
Successfully unlock the 2nd Stage.
Complete an event.
Win a Race or Sprint event and crossing the line doing a Wheelie on every lap.
Build an ATV from scratch in the garage.
Perform every normal trick in a single World Tour event.
During an event; perform a combo of at least 250,000 points.
During an event; perform every special trick in the game.
Earn a 1st place with every engine type in World Tour Mode.
Come from last place on the last lap to win a race event in World Tour Mode.
Complete World Tour Mode while participating in a maximum of 42 events.
Acquire a special trick within 30 seconds of starting a Race event.
Pull a special trick during a Sprint event.
Perform two special tricks in one jump.
Crash more than ten times and still win a competitive Race or Sprint event.