There are 50 Trophies that can be collected.

Bronze

Trick in
Perform and land a trick before sliding on a rail.

Grabbing hands
Perform 3 grabs while sliding on a rail.

Magnetic rails
Slide on 4 rails within one race.

Every trick in the book
Successfully perform each possible trick in the game.

No time to rest
After a crash, get back on track in less than 2 seconds.

Focused
Perfectly stay on the racing line in 4 bends in a bobsled race.

Shadow
Completely fill the slipstream bar 4 times within one short track race.

Gateway
Cut 5 gates in a row in a downhill skiing race.

Adrenaline rush
Use adrenaline for 4 consecutive seconds in a downhill skiing race.

Crash-landing
Ski Flying: jump a distance of 220 m and crash.

Immaculate inruns
Ski Flying: don't touch the sides of the track during the inrun on both attempts.

Finished symphony
Figure skating: sustain all notes within one event with perfect or super rating.

No trouble without double
Figure skating: win an event without activating double mode.

Show-off
Snowmobile: win a race crossing the finish line in reverse.

Traction control deactivated
Snowmobile: accumulate a drifting time of 10 seconds within one race.

Last man standing
Curling: win an end without any of the opponent's stones in the house.

Clean sweep
Curling: deliver a stone with low power and place it on the button by sweeping.

Come around
Curling: curl a shot directly behind another stone in the house.

Double takeout
Curling: takeout 2 of the opponent's stones with one shot.

Air ace
Paraskiing: accumulate an airtime of 90 seconds total within one race.

Long distance flight
Paraskiing: cover a distance of 500 consecutive meters while airborne.

Botanophile
Paraskiing: finish a race without touching any bushes or trees.

Gone with the wind
Paraskiing: fly through 6 gusts of wind in a row.

Experienced
Accumulate 25 experience points within one event.

Rivalry
Tackle your rival 5 times within one race.

Beat yourself
Beat a ghost you have recorded in time trial.

Yin
Earn three golden fairplay stripes.

Yang
Earn three black fairplay stripes.

Snowflake Cup
Place among the top 3 in the Snowflake Cup.

Lady Crystal Cup
Win the Lady Crystal Cup.

Teambuilding
Win 3 Cups in the first chapter of the career.

All the way to the top
Win 3 Cups in the second chapter of the career.

Level 5
Reach level 5 in the career.

Level 10
Reach level 10 in the career.

Warm up
Complete 5 challenges.

Amateur challenger
Complete 10 challenges.

Silver

Versatile victory
Land each possible trick within one race and win.

Accident-free
Win a bobsled race without collisions.

Catch up
Win a short track race without being in the lead in any but the last lap.

Shooting star
Biathlon: enter the shooting range in 4th place, hit all targets, leave the shooting range as 1st.

Picky
Biathlon: hit only targets 1, 3 and 5 in lap 1, only targets 2 and 4 in lap 2 and win the race.

Skillers United Championship
Win the Skillers United Championship.

Defending the crown
Win 3 Cups in the third chapter of the career.

Prime discipline
Max out your talent and buy all upgrades for any discipline.

Level 15
Reach level 15 in the career.

Competent challenger
Complete 20 challenges.

Professional challenger
Complete 30 challenges.

Gold

Winter Stars World Tour Finals
Win the Winter Stars World Tour Finals.

Challenge champion
Complete all challenges.

Platinum

Platinum athlete
Win all the Trophies in Winter Stars.

http://www.ps3trophies.com/forums/ps3-trophy-news/6683-winter-stars-trophy-list.html