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