**PLEASE keep in mind that I completed the game in ONE SITTING meaning I started playing at around 7:00PM (11/20)- then to about 1:00PM (11/21). Basically, I got 1000G without turning off my Xbox or leaving the game***
Ok ALOT of people report this as a glitched achievement.I had no problem unlocking this,my final achievement was for completing 30 waves.Now,it's not fully confirmed how this will glitch on you.
After about 8 months of questioning this achievement, it's kinda confirmed how it will glitch on you.. It's pure randomly. It might or might not glitch on you. But, ALWAYS FINISH WHAT START. Meaning don't quit out of anything like taunting with peter or quaqmire FINISH THE MULTPLAYER MATCH. Extremely important.
Anyway, the real thing is literally do every achievement all over again. Yeah you heard me. Start with the multiplayer achievements THEN the campaign achievements.It's more likely the multiplayer glitched on you then the single player.
If you have any more questions,feel free to comment.Remember,i'm not God so asking me a question doesn't mean you will still 100% this game.It's still unconfirmed.
Also,double check the store to see if everything is brought.Someone has reported that he got the achievement for getting everything in the store (Mort Will Now Lend You Credit) yet, things were still unbrought.SO basically check the store again.
Please comment if this glitched on you and you found another way to unlock this.
I would like to say that this glitched on me. How you ask? Well, I finished the 30 waves which took like 3 hours and it didn't pop. I almost lost my mind. I was back in the main menu and out of nowhere it suddenly pooped.
UPDATE 1- Ok so since this has 100+ comments, I have read all of them and really there can be ALOT of reasons why this glitches.It's no just MP achievements like I thought it was. Sadly, still no exact reason why this
UPDATE 2- Based on even more feedback, this is still no exact way to unlock this. As you can see in the comments, almost everyone has a different way they unlocked this. The only real solution is to complete the game...Again. Meaning, get every achievement again. It must be something with the saving system. which is why I said never to quit games.