Squid Jackpot!
From Halopedia, the Halo wiki
Squid Jackpot!
Squid Jackpot! is an achievement in Halo: The Master Chief Collection. It is unlocked by beating the 42,000 point par score on the level Kikowani Station. The achievement is worth 10 gamerpoints. Though it can theoretically be unlocked on any difficulty, more points are awarded in campaign scoring when playing on higher difficulties.
Tips
Players can earn significant points by destroying unoccupied Covenant vehicles (including Shade turrets) as the game does not differentiate between piloted and empty vehicles; Halo 3 and Halo 3: ODST are the only games in the Master Chief Collection with this campaign scoring quirk.
Trivia
The achievement is named for a line spoken in the level by Romeo: "We hit the squid jackpot!"