When Achievements first came out all of them were very easy to complete for example, (Making a wooden sword) or (opening your inventory) Here is list I thought up of:
1.Need a Light? (Place 30 Torches)
2.Welcome To hell! (Enter the Nether Realm)
3.Kaabooom! (Use TNT)
4.Burn! Baby Burn! (Set a mob on fire)
5.Green Thumb (Place 30 plants, such as flowers, saplings, sugar canes and seeds)
6.One in a million (Get struck by lightning and live)
7.Im melting! (Die by lava)
8.One who touched the sky (Reach to the highest point of the world)
9.Oooh Shiny (Find Diamonds)
10. Ewwww! (Kill or Die by a slime)
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Metapod uses harden! Metapod's defense has increased!
Diglet uses hidden power! ... BOOM! Diglet has grown a immense tank body!
GOt some more ideas for ya.
1. Like a baby
Sleep for a full night undisturbed by mobs.
2. Patience . . .
Mine 20 obsidian blocks.
Kill 10 Ghasts
4. Baker's dozen
Craft and eat 13 cookies.
5. The Hunter
Kill 15 monsters in a single night.
6. Its this way . . . no its not.
Travel at least 150 blocks away from your spawn point.
7. The fall
Travel from sea level to layer one without hitting any blocks.