Hard Work is Happy WorkG 50

Hard Work is Happy Work G50:
Successfully complete 50 Room Rushes

'Rushing' a room involves making a room that produces resources (generator, water purifier, etc) produce it immediately in addition to a caps reward. Simply select a room and press cn_up. This will bring up the rush confirmation screen, which also shows you the probability of success, and press cn_A. Rinse and repeat 50 times.
As the description suggests, failed rushes will not count, and failure will also have negative side effects on your vault such as Radroach attacks and fires, which in turn decrease your vault dwellers health and happiness, so if the probability is over 50%, don't chance it, and wait for the probability to be in your favor, which is about 45-47%. The probability will decrease over time, so it's best to be patient. Here's a little bit help from YouTube video link.

https://www.youtube.com/watch?v=_jRoXKaUiLw

The success of room rushes is influenced by the luck of the workers in the room, and each subsequent room rush has a higher chance of failure. It's very unlikely you won't unlock this through normal play, but just as general advice for room rushes, rooms filled with 6 dwellers that have 10 in Luck each have the best chance of successful rushes.