Here is the full list of all 39 UFC Undisputed 3 achievements worth 1,000 gamerscore.
Accumulate 15 hours of fight time.
Transition to all of the ground positions.
Play through each Training Game with a fighter in Career Mode.
Win 5 ranked Xbox LIVE matches in a row.
Play 10 or more ranked Xbox LIVE matches.
Win a ranked Xbox LIVE match for the first time.
Win 10 consecutive Fight Camp Exhibition matches.
Win a match on Ultimate in Exhibition or Tournament Mode with the Simulation Energy Settings.
Defeat a COM on Advanced or higher in Exhibition or Tournament Mode with each Leg Submission.
Win in each division in Exhibition with Advanced Difficulty or higher.
Play and complete a 6, 7 or 8 card event in Event Mode.
Create a Highlight Reel with 10 or more different fighters.
Create a Logo and apply it to a CAF as a Tattoo.
KO the opponent with a soccer kick.
After a KO or TKO, land 4 finishing blows and win the match.
Rock an opponent with a Foot Stomp to the head in a PRIDE fight.
Play an Xbox LIVE Fight Camp Sparring match.
Submission Slam or Stomp Escape the COM in Exhibition on Advanced Difficulty or Higher
Win a match against the COM on Experienced Difficulty while using a CAF in Exhibition Mode.
Join an Xbox LIVE Fight Camp.
Clear Title Mode without any interruption.
Watch a PRIDE entrance in Exhibition once without skipping.
Create a CAF and modify the face with CREATE A FIGHTER.
Get the TKO win by damaging the opponent's legs.
Select a guided tutorial
10,000 or more shop points accumulated.
Complete Career Mode with a CAF or Roster Fighter.
Rate contents created by other players in Content Sharing.
Enter the Hall of Fame with a fighter in Career Mode.
Use 1 fighter in Career Mode and win the WFA Championship, UFC Championship, and PRIDE Grand Prix.
Use 1 fighter in Career Mode to win the UFC championship in 2 weight divisions.
Obtain any level 3 move for 1 fighter in Career Mode.
Obtain a 4-star score in a Training Game with a fighter in Career Mode.
Create a Highlight Reel.
Play 500 or more ranked Xbox LIVE matches.
Win against a CAF that obtained Career Hall of Fame in Exhibition on Expert Difficulty or higher.
Win 25 fights consecutively in Title Defense Mode.
Obtain a 100% completion score with both fighters in a fight in Ultimate Fights Mode.
Clear 25% or more of all game modes.