Reading Room

Reading Room is an achievement in Halo: The Master Chief Collection. It is unlocked by beating the 25,000 point par score on The Library. The achievement is worth 10 Gamerscore. Though it can theoretically be unlocked on any difficulty, more points are awarded in campaign scoring when playing on higher difficulties.

Tips
Turn on the Catch, Thunderstorm, Piñata and Boom skulls on legendary difficulty. As the Flood cannot use grenades and only have a single rank, Catch and Thunderstorm are free bonus multipliers. Smack the Flood pod infectors to get plasma grenades and keep your distance from Flood carrier forms as Boom increases their blast radius as well. As long as you don't die too many times, you should get enough points without factoring in the time bonus.

Trivia
The name of the achievement is a reference to the typical meaning of the word "library".