In your gaming career?
Mine is finishing Star Wars Tie Fighter on the hardest difficulty without ever calling for backup (except for that "Osprey" mission where the game's plot forced you to call in reinforcements). After playing X-wing, I wanted to see if I could max out rank and medals in the Imperial navy. Can't remember if I achieved that goal, and I got killed a ton, but I did finish. Hardest difficulty. No backup.
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