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