Here is the full list of all 21 Bears Can't Drift!? (EU) trophies - there are 8 bronze, 4 silver, 8 gold and 1 platinum.
Collect every trophy
Collect every hat.
Unlock the pigeon hat and wear it proudly
Hit yourself with a mortor strike.
In four player splitscreen, finish a race in 1st, 2nd, 3rd and 4th respectively.
Steal the flags from a friend.
Rank first on every time trial event.
Gold Star every track in the Ruin world.
Rank first in half of the time trial challenges
Gold Star every track in the Arctic world.
Destroy a camera!
Find a hat during a race or picnic battle and come 1st, 2nd or 3rd.
You gave it your best, but it wasn't good enough.
Gold Star every track in the Forest world.
Get a top time on any track.
Come First place in any race or picnic battle.
Use every weapon combo in a single match
Complete the special thanks mini game.
Activate Hard difficulty mode.
Activate medium difficulty mode.
Activate easy difficulty mode.