This is basically a checklist for you :)

Craft a Bed
Get all the wool colors
Make a fireplace of Brick   (Not Stone Brick)
Craft a Piston
Mine up some Diamonds!!! 
Find the dungeon
Make a Pumpkin farm
Make a Melon Farm
Make a Wheat Farm
Get 64 Saplings
Get some obsidian 
Go to the Nether
Make a house out of a giant red mushroom 
Get 64 Steaks 
Get 64 Porkchops 
Craft some TNT
Craft a Golden Apple 
Make a Sugar Cane Farm
Make a Giant Mushroom Farm
Make some Glowstone
Find a Cake
Get a Ghast Tear
Brew up to 5 different potions
Make Chainmail Armor
Get Some Netherrakk
Get 32 Bookcases (Thanks Noodle_13!)
Find the Hidden Nether Portal
Craft Full Leather Armor
Craft Full Iron Armor
Craft Full Gold Armor
Craft Full Diamond Armor
Find Secret Temple
Make a Blaze Mob Trap
Get a 64 Stack of Glowstone
Go to the End
Kill the Enderdragon
End the Game!
Decipher all WAKAN Signs
Make a Cobblestone Generator
Get 32 Enderpearls
Make a Mob Grinder
Make an XP Farm
Completely Light Each Island
Saddle a Pig
Create a Lava Fountain on the Desert Island
Find All Buried Treasure
Find the Hidden Emeralds
Discover the End Island
Don't Set Off Any TNT Traps
Enter the End Chamber
Enter End Chamber without removing Lava
Get 4 Cookies
Grow 1 of Every Kind of Tree
Make a Carrot Farm
Make a Potato Farm
Make a Poisonous Potato
Make a Golden Carrot
Get 32 Nether Wart
Make 16 TNT
Add a Water Fountain to the Spawn Island
Get a Potion of Fire Resistance
Connect Each Island Together
Get 64 Mushroom Stews
Decipher Every WAKAN Language Sign
Write a Book
Ride a Pig With a Carrot on a Stick
Make a Firework
Use A Wakan Teleporter
Complete King Waka's Quest
Collect the Enderdragon Egg
Collect 64 Snowballs
Make a Snow Golem
Make a Iron Golem
Forgive your Father (?)
Repopulate the Islands
Trade with a villager
Change a Zombie Villager back
Find King Waka
Use the LEGENDARY SWORD OF WAKA
Offer an item to the Wakan Gods
Find the 3 Hidden Wither Skulls
Make the Wither Boss
Kill the Wither Boss
Get a Nether Star
Make a Beacon
Get 16 Nether Quartz
Make a Daylight Sensor
Craft 64 Nether Brick Blocks
Craft a Magma Cream
Find all of the Artifacts
Complete all of the Quests


