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