How Did I Lose All My Fingers?
From Halopedia, the Halo wiki
How Did I Lose All My Fingers is an achievement in Halo: The Master Chief Collection. It is awarded by beating the 65,000 point par score on The Package in Halo: Reach. Though it can theoretically be unlocked on any difficulty, more points are awarded in campaign scoring when playing on higher difficulties.
The name of the achievement references the Red vs. Blue short What I Did On My Summer Vacation, in which the character Caboose played the role of Noble Six in the campaign of Halo: Reach and dubs dialogues over some of the cutscenes featuring Noble Six. The name of the achievement was spoken by Caboose verbatim in the opening cutscene of The Package when Noble Six raises his clenched fist before signalling the ODSTs.