Here is the full list of all 35 Fallout Shelter achievements. It takes around 80-100 hours to unlock all of the achievements on Windows.
Complete 100 objectives
Craft 1 of every room theme
Collect 20 Legendary outfits
Scrap 500 items
Collect 20 Legendary weapons
Complete 100 Quests
Build 1 of every room type
Level up a Dweller to level 50
Collect all Pieces of 4 Themes
Complete 60 Quests
Craft an Outfit, a Weapon and a Theme
Collect all Pieces of 1 Theme
Change the appearance of 10 NPCs in the Barbershop
Upgrade 20 Rooms to Level 3
Collect 100 Stimpacks and 100 Radaway on Quests
Craft 10 Outfits
Complete 30 Quests
Level up a Dweller to level 25
Make 25 Dialogue Choices in Quests
Craft 10 Weapons
Kill 500 enemies on Quests
Make 25 babies
Build 50 rooms
Complete 10 Quests
Kill 10 Quest Bosses
Level up a Dweller from 1 to Level 10
Collect 10,000 Caps
Build 25 rooms
Successfully complete 50 Room Rushes
Merged 3 Power Rooms
Merged 3 Food Rooms
Merged 3 Water Rooms
Collect 1000 Caps
Collect 20 Legendary Dwellers
Successfully stop 50 Raider Attacks