The One and Only - Mass Effect Legendary Edition
This video shows you how to get the 'The One and Only' achievement in Mass Effect Legendary Edition. This still works post the latest patch, just switch to Normal mode just before you kill the last enemy in the third wave.
This achievement is unlocked in the Armax Arsenal Arena in Silversun Strip, an area of the Citadel accessible in the Citadel DLC that is available after you complete the mission Priority: Citadel II. First I played 4 arena matches (Geth on Narrative) to earn 4 silver medals. I used these 3 to purchase modifiers (no medi-gel, no ammo crates, reduced shields). Using the last medal I purchased Elite Challenges. Play 1 more arena (again on Narrative) match using modifiers but this time choose Elite, this will get you a gold medal. Use the gold medal to purchase the Mirror Match Combat Set, which is what you need to play to unlock this. Start the match on Narrative, then just before you kill the last guy, switch to Normal, kill the last guy, and your cheevo will pop.
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