Full list of all 18 Raskulls achievements worth 300 gamerscore. It takes around 8-10 hours to unlock all of the achievements in the base game on Xbox 360.
The base game contains 12 achievements worth 200 Gamerscore, and there are 2 DLC packs containing 6 achievements worth 100 Gamerscore.
Win a race in Mega Quest!
Defeat that dastardly Thief at the end of Chapter 1.
Unleash your power and defeat the boss at the end of Chapter 2.
Complete the Mega Quest and bring peace to the Raskulls.
Collect every Medallion in the Mega Quest.
Win a four-player local Grand Prix match – and don't forget to brag about it!
Win 5 Xbox LIVE Grand Prix matches!
Win by jumping off another Raskull to an out of reach finish. (Local or Xbox LIVE multiplayer)
Hit three other Raskulls with a single Flame Charge.
Keep a single Frenzy going for 10 seconds. (Excludes Mega Quest bosses and "Stay Frenzied" races.)
Destroy 20,000 blocks across all modes. (That is, the small blocks that make up the big blocks.)
Launch Raskulls upwards with the Thunder Staff 10 times. (Local or Xbox LIVE multiplayer.)
Finish the Shiny Stone Cup without being crushed.
As Kitten, win a race with a Stun All in reserve.
As Viking, rebound a Flame Charge with Wand Push.
Finish the Halfbrick Cup without being burnt by lava.
Win on Tempest Tunnels by Flame Charging upwards to the Finish.
As Battlebones, win a race without using Frenzy.