Ace of spades: Kill 50 hostile mobs with a shovel.
Ace of diamonds: Mine 20 diamonds.
I believe I can fly: Jump to your death.
Here I come: Travel to the nether.
Braveness: Punch a creeper to death.
Burnt fists: Punch 20 ghast balls.
Golden fists: Punch a ghast to death.
Destruction: Make TNT.
Lord of destruction: Destroy 100 blocks with TNT.
Iron man: Run into lava and survive.
No mercy: Kill a hostile mob with only half a heart left.
Nomad: Travel 10,000 blocks.
The Lumberjack: Chop 100 logs.
Superior: Craft full set diamond tools and armor.
Wolf tamer: Tame a wolf.
Escape: Fall into the void.
Iron Age: Smelt 64 iron ores.
Roasted Pork: Watch a pig get struck by lightning.
Extreme: Kill a charged creeper.
Treasure hunter: Find 5 dungeons.
Mob slayer: Kill 20 mobs.
Mob Dominate: Kill 50 mobs.
Killing Machine: Kill 100 mobs.
Chef: Craft 10 food.
Iron Chef: Craft 30 food.
Master Chef: Craft 50 food.
L33t: Kill 1337 mobs.
I will add more and please leave a comment if you like it.