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UFC 2009 Undisputed Single Player
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If you follow this guide, you will unlock all single player achievements totaling 555 GS. Before using the saves, you will need to play career and get 'Undisputed Champion' on your own or else it will unlock out of order. I'm sorry about that. I forgot to make a save before it. Hopefully, you already got it if you played the career.

The following achievements must be done legit. The only achievement that is kind of hard is 'That was easy!' which is to knockout your opponent in less than 20 seconds. I recommend you get these out of the way first before moving on to the saves, but it's entirely up to you. These can be done in any order.
Legit Achievements
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1. That was easy! (MEDIUM/HARD)
Easiest way to do this is to pick a good fighter (I used Chuck Liddell) and only perform heavy punch and kick attacks until you knock your opponent out. Must be done in 20 seconds or less. Here's a video on Youtube if you're having trouble - YouTube - UFC 2009 Undisputed - That was easy! Achievement 15GS (HD 720p)
2. World Class Striker
(EASY)
Only perform striking attacks until your opponent is knocked out. I used Chuck Liddell.
3. World Class Grappler (EASY)
Submit your opponent without striking. Perform a clinch and do body slams until your opponent is worn out and then perform a submission move.

4. Ultimate Knockout (EASY)
Get into a gassed state and knock your opponent out. Turn on the stamina bars in the options menu and keep throwing heavy body kicks until your stamina bar is drained. Once it is fully drained, then start throw heavy high kicks until your opponent is knocked out.
5. Ultimate Submission (EASY)
Get into a gassed state and submit your opponent. Turn on the stamina bars in the options menu and fight until you are worn out but do not perform any striking moves. Just do body slams. Then perform a submission move.
6. Ultimate Highlights (EASY)
To get this, just dominate your opponent in all three rounds of the match, but DON'T knock them out. You must watch all the replays in between the rounds.
7. Wanted: Flying Mouthpieces (EASY)
This is pretty random, but you should get it if you play a lot. Simply use heavy high kicks on your opponent to knock them out and you will eventually get this one.

Once you get those achievements out of the way, it's now time to use the saves.

1. Student of the Game
Go to Tutorials and select GUIDE. Select Navigation and do the first objective. Achievement will pop after completion.

2. UFC Historian
Go to Classic Fights and select UNLOCKABLES. Achievement will pop.

3. Two of my favorites!
Go to Exhibition and see the Ring Girl animation one more time.

4. Roster Run-through
Go to Exhibition and select any fighter and complete one match win or lose. Achievement will pop after it saves.

5. Wax Off!
Go to Exhibition and select LIGHTWEIGHT as your fighting class. Select BJ Penn and Nate Diaz as your opponent. As soon as the match starts, run up to Diaz and clinch (RS forward) and then hold LB and RS back to drop on your back. Let him try to submit you. As he is submitting you, rotation the RS clockwise as fast as you can to do a technical escape. Only need to do one more.
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WARNING! THE FOLLOWING ACHIEVEMENTS INDICATED BY ** WILL UNLOCK OUT OF ORDER AND AT THE SAME TIME. DO NOT CONTINUE IF YOU DON'T HAVE 'Undisputed Champion'. I RECOMMEND YOU PLAY CAREER AT LEAST ONCE ON YOUR OWN SAVE TO GET 'Undisputed Champion' FIRST, THEN FOLLOW THESE INSTRUCTIONS AND DO IT OFFLINE.
6. Pound-for-Pound Champion**, Undisputed Champion**, Where's my bonus check?**
Go to Career and load up the first fighter named 'Dave'. Select 'Yes' to continue the fighter's career.
All three achievement will pop after it finishes loading.
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7. Hall of Famer, Call me "No Touch!", Trophy Collector
Then select 'Calendar' and keep choosing to rest until you reach the last fight with Gabriel Gonzaga. Easiest way to beat him is to perform high heavy kicks (LB+A or LB+B) until you knock him out. Watch the credit if you want or skip them by pressing the start button. All three achievements will pop at this point in legit order.

These saves also have all the online achievements, but I did not test them. I heard they pop after winning or losing one ranked match, but I would not recommend you do this since they will unlock all at the same time.


Thank to tsrancyo