Fallout Shelter

This achievement is pretty easy as its just a natural progression achievement but i thought id go ahead and write down what i did.

When i started this game i went ahead and bought the starter pack for five dollars, which you can only buy once, and used the nuka-cola quantums that came in it to accelerate this achievement. Basically i picked three dwellers and made them the "quest team". You'll want to use the same three because some of the quests down the line require the dwellers to be a cetain level. Basically i would just go through a whole quest train sending the team to the quest, then id usually get 1-3 quantums during the quest, then using quantum to bring them back if it is 2 or less but like i said earlier you really dont need to use the quantums for this achievement, they just make it go faster.

As soon as you have 18 or more dwellers in your vault you will unlock the Overseer's Office, you will use it to send a person or group to a quest, where at the end of it you will have some rewards. You must complete 30 of them to unlock this achievement, I recommend you to send 3 people together at the beginning of the game, probably your dwellers should not be well trained yet.