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