Full list of all 75 The Elder Scrolls V: Skyrim achievements. It takes around 200 hours to unlock all of the achievements in the base game on Windows.
The base game contains 50 achievements, and there are 3 DLC packs containing 25 achievements.
Complete 10 side quests
Complete "Elder Knowledge"
Complete "The Fallen"
Complete "Dragonslayer"
Complete "Glory of the Dead"
Complete "Darkness Returns"
Returned the Thieves Guild to its former glory
Capture Fort Sungard or Fort Greenwall
Capture Solitude or Windhelm
Pick 50 locks and 50 pockets
Find 13 Standing Stones
Buy a house
Bounty of 1000 gold in all nine holds
Collect 15 Daedric Artifacts
Absorb 20 dragon souls
Reach Level 50
Complete "Alduin's Wall"
Complete 50 Misc Objectives
Learn 20 shouts
Read 50 Skill Books
Complete "Diplomatic Immunity"
Complete "The Eye of Magnus"
Complete "Revealing the Unseen"
Clear 50 dungeons
Acquire a Daedric Artifact
Become a member of the Circle
Complete "The Way of the Voice"
Have 100,000 gold
Join the Companions
Get married
Escape from jail
Join the Thieves Guild
Join the Stormcloaks or the Imperial Army
Join the College of Winterhold
Get a skill to 100
Absorb a dragon soul
Learn all three words of a shout
Discover 100 Locations
Reach Level 25
Complete "Hail Sithis!"
Successfully persuade, bribe, and intimidate
Complete "Bound Until Death"
Join the Dark Brotherhood
Reach Level 10
Make a smithed item, an enchanted item, and a potion
Chop wood, mine ore, and cook food
Complete "Bleak Falls Barrow"
Reach Level 5
Select a Standing Stone blessing
Complete "Unbound"
Complete "The Path of Knowledge"
Complete "At the Summit of Apocrypha"
Learn all 3 words of Dragon Aspect
Learn the secrets of 5 Black Books
Tame and ride 5 dragons
Own a house in Raven Rock
Discover 30 locations on the island of Solstheim
Complete "The Temple of Miraak"
Arrive on Solstheim
Craft an item out of Stalhrim
Complete "Kindred Judgment"
Complete "Lost to the Ages"
Learn all three words of Soul Tear
Use the special power of Auriel's Bow
Acquire 11 werewolf perks
Acquire 11 vampire perks
Change your face
Defeat a Legendary Dragon
Complete "Beyond Death"
Complete "Awakening"
Adopt a child
Buy a plot of land
Build three wings on a house
Buy three plots of land
Build three houses