Full list of all 50 Sonic Unleashed achievements worth 1,000 gamerscore. It takes around 60-80 hours to unlock all of the achievements on Xbox 360.
Save the first continent
Save the second continent
Save the third continent
Save the fourth continent
Save the fifth continent
Save the sixth continent
Complete the game
Collect Sun Medals
Collect all of the Sun Medals
Collect Moon Medals
Collect all of the Moon Medals
Create an unbeatable Hedgehog
Create an unbeatable Werehog
Get a high score with Sonic the Hedgehog
Get a high score with Sonic the Werehog
Help someone in need
Improve your Stomp!
Improve your Wall Jump!
Improve your Air Boost!
Improve your Lightspeed Dash!
Get your Werehog level up
Get your Werehog level up some more!
Get your Werehog level up even higher!
Get your Werehog level way up there!
Talk to people around the world
Eat everything in the world
Pull off some flawless flying
Race through all stages
Blast through all stages
Drive dark spirits away
Eat all the hot dogs in Apotos
Eat all the hot dogs in Spagonia
Eat all the hot dogs in Mazuri
Eat all the hot dogs in Chun-nan
Eat all the hot dogs in Holoska
Eat all the hot dogs in Shamar
Eat all the hot dogs in Empire City
Eat all the hot dogs in Eggmanland
Eat all the hot dogs in Adabat
Buy something from Wentos
Give a souvenir to the Professor
Give every souvenir to the Professor
Talk with people in the pursuit of love
Someone is dealing with spectral troubles
Become better friends with Chip
Become the fastest thing alive
Work on your combos
Gather Rings from all over the world
Smash, smash, and smash some more
Dash through the white walls at top speed