Here is the full list of all 38 FIFA 15 achievements worth 1,000 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox 360.
Start a Co-op Seasons match with a friend
Finish a Friendlies Season
Win a Friendly Season in FUT
Have your Pro featured in the team of the week in Player Career
Copy a Squad from the end of an online match in Ultimate Team
Beat a 5 Star Legendary CPU AI team with a 3 Star or lower team
Score from a direct Free Kick at a distance greater than 30 yards.
Complete a Match Day Challenge in Highlights of the Week on at least World Class difficulty
Play Seasons with a Guest
Prevent a goal with a Sliding goal line clearance
Score 1 goal with a Toe Poke
Comment on an EA SPORTS Football Club Activity
Tag an EA SPORTS Football Club Activity
Beat a friend's Skill Game score
Open 20 packs in FUT
Earn Promotion in Seasons
Play a consecutive match in Seasons
Save 3 Penalty Kicks Shots (in game, not shootouts) with the GK.
Win a trophy as a Team Manager in Career
Fill up all Team Sheets Slots
Create a New Team Sheet
Scout and find a player with any combination of 3 Global Transfer Network attributes in Career
Enable a custom Free Kick or Penalty style for your Pro
Sign a Loan Player from the EAS FC Catalogue
Change your captain in FUT
Win a division title in FUT Seasons
Earn a player's loyalty in FUT by playing 10 or more games with him
Score 1 goal with a Knuckle Shot
Buy a player who is in a league above you
Complete all Drills in Learn to Play > The Basics
Play a Game of the Week in Highlights of the Week
Beat the Keeper 1 on 1 and score
Apply your first Chemistry Style consumable in FUT
Share an EA SPORTS Football Club Activity
Challenge the Team of the Week in FUT
Perform a Standing Tackle and keep possession of the ball 10 times
Gift an EA SPORTS Football Club Catalogue Item
Reach EAS FC level 15