Here is the full list of all 50 Street Fighter X Tekken achievements worth 1,000 gamerscore.
Activate Cross Assault 500 times.
Activate Pandora 500 times.
Connect with 500 Super Arts.
Connect with 500 Cross Arts.
Finish a round with Cross Assault 300 times.
Finish a round with a Super Art 300 times.
Finish a round with a Cross Art 300 times.
Clear all of the missions in Mission mode.
Unlock all Achievements.
Fight 500 matches over Xbox LIVE.
Use Arcade Fight Request 30 times.
View 50 replays in the Replay Channel.
Fight 300 matches over Xbox LIVE.
Connect with 500 EX Special Moves.
Connect with 500 Launchers.
Activate your Assist Gems 100 times.
Finish a round with Pandora 300 times.
Use a character in battle over 300 times.
Win a round without getting hit 100 times.
Clear 300 trials in Trial mode.
Obtain 300 Titles.
Win 100 matches over Xbox LIVE.
Connect with 100 Quick Combos.
Get to C rank for the first time in Ranked Match.
Have your replay downloaded 20 times in My Channel's Broadcast Mode.
Fight 100 matches over Xbox LIVE.
Win 50 matches over Xbox LIVE.
Connect with 500 Special Moves.
Defeat 5 rival teams in Arcade mode on Medium difficulty or higher.
Defeat all of the bosses in Arcade mode on the hardest difficulty.
Clear all of the lessons in the Tutorial.
Go into Training mode 10 times.
Create 10 lobbies in Endless Battle.
Raise your battle class rank for the first time in Ranked Match.
Fight 50 matches over Xbox LIVE.
Activate your Boost Gems 100 times.
Clear one mission in Mission mode.
Win 10 matches over Xbox LIVE.
Win 5 matches over Xbox LIVE.
Access the Store.
Clear ten trials in Trial mode.
Clear one trial in Trial mode.
Win in a Ranked Match.
Customize a character's color.
Customize a Gem Unit.
Customize your player comment.
Clear Arcade mode on Medium difficulty or higher.
Win a match in Endless Battle.
Customize your player Title.
Clear one lesson in the Tutorial.