Which achievement are you most proud of?
Mine is the "Star 69"- achievement from Modern Warfare 2. You have to earn all 69 stars in spec ops to get this.
After countless months trying the last mission me and my friend were missing, we got it and freaked out. I will never forget that.
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Mr. Perfect from Megaman 9, beating the entire game without ever getting hit. I just chipped away at that for about a week trying to form consistent strats. Absolutely crushing to fail the run on the last boss, had to come up with some strong defensive tactics to deal with the fight.