Titanfall
88 Achievements
2,000
320-425h
Runoff Connoisseur
Played every game mode on Runoff
10
0.71%
How to unlock the Runoff Connoisseur achievement in Titanfall - Definitive Guide
This means that to get the Achievement you either have to win on each map and game type or lose and see the epilogue sequence on each map and game type, it's not enough to just start up a match on each map and quit out. Going by the stats screen, I had three matches "played" on this map, having quit out every time while boosting Pilot Hunter wins, and the Achievement didn't unlock until I WON a match on the map since that was the first time I had FINISHED a match on that map.
You need to play on Runoff at least once in each of the primary five game modes: Attrition, Capture the Flag, Hardpoint, Pilot Hunter, and Last Titan Standing. Note that you do not need to win, simply finish a match. Except in Last Titan Standing, your opponent can quit out and it will still count for a game completed (and a win). Note that since you cannot pick your map you will need for the map to show up in rotation. Playing a single game type without leaving the lobby will ensure that all maps show up in a random but repeating cycle. This may take 3-4 hours, but is the only way to guarantee that you will play on this map in the chosen game mode.
You can track your progress by choosing Personal Stats -> Levels and finding this map in the list. The middle column tracks games played by type so you can identify which game modes are still needed for any given map.