Nice Work Dawg!

Nice Work Dawg! is an achievement in Halo: The Master Chief Collection. It is unlocked by earning a total of 2,500 Assist medals in multiplayer; this includes both matchmaking and custom games. Spartan Ops missions are considered custom games. Assists earned in Halo: Reach Firefight do not count. The achievement is worth 5 Gamerscore.

Tips
Players attempting to unlock the achievement should avoid playing Halo 3 multiplayer matches, as it is the only game in the Collection which does not award the Assist medal.

Trivia
The achievement's name probably comes from a line frequently spoken by Marine NPCs in Halo: Spartan Assault.