Here is the full list of all 46 FIFA 15 trophies - there are 36 bronze, 6 silver, 3 gold and 1 platinum.
Prevent a goal with a sliding goal line clearance
Play a Drop-In Match in Pro Clubs Seasons
Against the CPU on Legendary, score a goal past the 80th using the All Out Attack mentality
Play Seasons with a Guest
Leave your club on Loan or by Transfer in a Player Career
Reach Level 15 or beyond in FIFA 15 in the EA SPORTS Football Club
Manage three different clubs in three different countries in a single Career
Perform a slide tackle and keep possession of the ball 10 times
Score a goal with a knuckle shot
Copy a Squad from the end of an online match
Earn a player's loyalty in FUT by playing 10 or more games with him
Import a Team Sheet
Earn Promotion in Seasons
Create and win a Custom Tournament with more than 16 teams
Comment on an EA SPORTS Football Club Activity
Gift an EA SPORTS Football Club Catalogue Item
Rate an EA SPORTS Football Club Activity
Beat a Friend's Skill Game Score
Score off the post or cross bar in a match
Create a new Team Sheet
Play a consecutive match in Seasons
Playing against the CPU on Legendary, avoid conceding from the 70th on with Park the Bus mentality
Beat a 5 Star Legendary CPU AI team with a 3 star or lower team
Challenge the Team of the Week in FUT
Open 20 packs in FUT
Change your captain in FUT
Win a division title in FUT Seasons
Change your Tactics in Team Management during a match
Play a match in Match Day Live
Beat the keeper 1 on 1 and score
Apply your first Chemistry Style consumable in FUT
Sign a Loan Player from the EAS FC Catalogue
Purchase an EA SPORTS Football Club Catalogue Item
Share an EA SPORTS Football Club Activity
Assign Player Instructions to a player in a Team Sheet
Score a goal with a Flair Shot
Score a goal with a toe poke
Unlock a Skill Challenge
Unlock all other trophies (excluding additional content trophies)
Score from the ground
Win a Friendly Season in FUT
Unlock 10% of the accomplishments with your Online Pro
Enable a custom Free Kick or Penalty Style for your Virtual Pro
Start a Co-op Season with a Friend
Finish a Friendlies Season
Win your first Pro Club Seasons league match