Play as Mask - Have three consecutive tapout or submission wins in Career mode to unlock Mask from Tapout in Exhibition mode in the light heavyweight class.

Play as Punk Ass - Get the "Tapout" sponsorship in Career mode to unlock Punk Ass from Tapout in Exhibition mode in the lightweight class.

Play as SkyScrape - At the title screen, press Up(3), Down, Left, Right, Up, Start to unlock SkyScrape from Tapout in Exhibition mode in the middleweight class. He is rated 74 overall.

Infinite Create-A-Fighter points - In Create-A-Fighter mode, preview a fighter. Toggle his stats on, then off. Select him, and choose the "Customize Attributes" option. You will now have 3024 points to distribute. Distribute all the points, then select "Finished". Once the game saves, go back to Create-A-Fighter mode, and repeat the process until every skill is at 100. Note: This only works for fighter skills; Cardio, Speed, and Strength attributes are not affected by this glitch. This trick does not work in Career mode. It also only works in the unpatched version of the game.

Credibility bonuses

Sponsors

Level 1 Sponsors: 1,500 to 15,000 Credibility
Level 2 Sponsors: 17,000 to 35,000 Credibility
Level 3 Sponsors: 37,500 to 60,000 Credibility
Level 4 Sponsors: 63,000 to 75,000 Credibility
Level 5 Sponsors: 78,500 to 92,500 Credibility

Gym equipment

Boxing Ring: Already available.
All Level 1 Training Equipment: Already available
Level 2 Training Equipment of your choice: 2,400 Credibility
Level 2 Training Equipment of your choice: 9,150 Credibility
Level 2 Training Equipment of your choice: 12,900 Credibility
Level 3 Training Equipment of your choice: 20,400 Credibility
Level 3 Training Equipment of your choice: 27,900 Credibility
Level 3 Training Equipment of your choice: 35,400 Credibility
Octagon Cage: 25,000 Credibility.
Full-Size Octagon Cage: 50,000 Credibility.

Sparring partners

Level 1 Sparring Partner: Already available; 50% Skill Bonus/Penalty
Level 2 Sparring Partner: 6,210 Credibility; 75% Skill Bonus/Penalty
Level 3 Sparring Partner: 19,150 Credibility; 100% Skill Bonus/Penalty
Level 4 Sparring Partner: 27,780 Credibility; 125% Skill Bonus/Penalty
Level 5 Sparring Partner: 45,030 Credibility; 150% Skill Bonus/Penalty

Sponsors - The following sponsors are available with the listed sponsor level:

Level 1

Yuke's
Virol
Ultor Unlimited
Wondermart
XXYY
Urban Predator
Akustics
Metobolic Adaptation
FYT
Take A Nap

Level 2

THQ
Rumble Fight Wear
Microtech
Nuvasive
Sucker Punch
And 1
NOGI
OTM
One More Round
Headblade

Level 3

Premier Fighter
Deatch Clutch
Hitman
Xyience
Fairtex
RVCA
Toe2Toe
Pain-Inc
Clinch Gear
Skin Industries

Level 4

Harley Davidson
Hostility
American Fighter
Hayabusa
Sinister

Level 5

Conquest
MMA Warehouse
Warrior International
Sprawl
Tapout

Trophies - Successfully complete one of the following tasks to get a trophy:

Where's my bonus check? (Bronze): Obtain the KO, Submission and Fight of the Night Awards with a fighter in Career Mode.
That was easy! (Bronze): Win in under 20 seconds of the 1st round against a COM UFC Fighter in Exhibition or Career Mode.
Wax Off! (Bronze): Escape 20 submissions by technical escape against a COM UFC Fighter in Exhibition or Career Mode.
White Belt (Bronze): Win an online Ranked Match with a CAF or UFC fighter.
Blue Belt (Bronze): Win 15 online Ranked Matches with a CAF or UFC fighter.
Undisputed Champion (Silver): Win the UFC Championship with a fighter in Career Mode.
Hall of Famer (Silver): Enter the Hall of Fame with a fighter during Career Mode.
Student of the game. (Silver): Complete all tasks from the Tutorial Mode.
Trophy Collector (Silver): Obtain all the trophies in Career Mode with a fighter.
UFC Historian (Silver): Unlock all movies from the Classic Fights Mode.
World Class Striker (Silver): Win by KO without using any grappling moves against a COM UFC Fighter Exhibition or Career Mode.
World Class Grappler (Silver): Win by Submission using no striking moves against a COM UFC Fighter in Exhibition or Career Mode.
Roster Run-through (Silver): Complete one fight in Exhibition Mode with each UFC fighter.
Purple Belt (Silver): Win 30 online Ranked Matches with a CAF or UFC fighter.
Brown Belt (Silver): Win 50 online Ranked Matches with a CAF or UFC fighter.
Wax On! (Silver): Win 15 online Ranked Matches with a CAF or UFC fighter by submission.
Papa Said Knock You Out! (Silver): Win 15 online Ranked Matches with a CAF or UFC fighter by KO.
Gold Digger! (Silver): Obtain all the gold medals in a Weekly Mission for Online Mode.
You really like me! (Silver): Gain a million or more fans in Online Mode.
Ooh, in ya face! (Silver): Win a fight by flash KO in a Ranked Match with a CAF or UFC fighter.
Original fighter (Silver): Create A Fighter and use the CAF in Exhibition or Online Mode.
Pound-for-Pound Champion (Gold): Win the UFC Championship in each weight class in Career Mode.
Call me "No Touch!" (Gold): Complete Career Mode and retire undefeated.
Black Belt (Gold): Win 100 online Ranked Matches with a CAF or UFC fighter.
Red Belt (Gold): Reach level 50 or higher in Online Mode.
Platinum (Platinum): Obtain all Gold, Silver, and Bronze Trophies!

Additionally, there are five secret trophies:

Two of my favorites! (Bronze): Watch the Octagon Girl cutscene 15 times without skipping it.
Wanted: Flying Mouthpieces (Bronze): Mouth piece travels more than 3 meters when knocked out.
Ultimate Highlights (Bronze): Dominate the opponent in all 3 scenes of a replay segment.
Ultimate Knockout (Bronze): From the gassed state, KO an opponent in any mode.
Ultimate Submission (Bronze): From the gassed state, Submit an opponent in any mode.