Make it something like Team Fortress 2 and categorize them, instead of having to complete one to be able to unlock another...
General achievements:
Benchmarking (Make a workbench)
Getting Wood (Get a piece of wood)
Taking Inventory (Open your inventory)
I Wish I Could Fly Right Up To The Sky (Reach the highest possible height)
World Traveler (Walk 100,000 blocks)
Triathlete (Walk, Swim, and Ride 5000 blocks by minecart)
Ice Skater (Walk 10,000 blocks on ice)
Extinguished (Walk into water while burning)
Base Jumper (Take 9.5 hearts of fall damage without dying)
Glider (Travel 25,000 blocks while airborne)
Scavenger (Pick up 10,000 items)
Warped (Travel through a portal)
When Pigs Fly (Ride a pig off a cliff)
(Under) World Traveler (Walk 10,000 blocks in the Nether)
Ultimate Minecrafter (Complete every other achievement)
Combat Achievements:
Time to Strike! (Make a sword)
Cow Tipper (Kill a cow)
Monster Hunter (Kill a hostile mob)
Creeper Conqueror (Kill 200 Creepers)
Skeleton Slayer (Kill 200 Skeletons)
Zombie Killer (Kill 200 Zombies)
Spider Hunter (Kill 200 Spiders)
Monster Murderer (Kill 1000 hostile mobs)
Warrior (Kill 1000 hostile mobs with a sword)
Marksman (Kill 1000 hostime mobs with a bow and arrows)
Dog Trainer (Have one of your tamed wolves kill a hostile mob)
The Minecraft Massacre (Kill every single NPC in a village)
Rumored Raider (Destroy a mob spawner in a dungeon)
Dangerous Dungeoneer (Destroy 10 mob spawners)
Champion Conqueror (Destroy 25 mob spawners)
GET OFF MAH LAWN (Kill a hostile mob that is within 10 blocks of a place where you destroyed a mob spawner)
THIS IS SPARTA!!! (Attack a mob and cause it to fall to its death)
UMADBRO? (Cause a hostile mob that was attacking another hostile mob to attack you)
Charged With Manslaughter (Kill a charged creeper)
Building Achievements:
Carpenter (Place 2000 wooden planks)
Hot Topic (Build a furnace)
Acquire Hardware (Get an iron ingot)
On A Rail (Build a rail)
Fortification (Build a wall 3 blocks high and 20 blocks wide out of cobblestone)
Fortification, Part 2 (Build a wall 3 blocks high and 20 blocks wide out of bricks)
Fortification, Part 3 (Build a wall 3 blocks high and 20 blocks wide out of iron blocks)
Trapper (Have a block that you placed kill a mob)
Busy Builder (Place 100,000 blocks)
Teleporter Goin' Up! (Build a portal)
Dispenser Goin' Up! (Build a dispenser and put food inside it)
Sentry Goin' Up! (Kill a mob with an arrow that was shot by a dispenser)
Diamond Ring (Place a diamond block)
Shipwright (Build 100 Boats)
Automotive Engineer (Build 100 Minecarts)
Road Builder (Place 1000 minetracks)
Automatic Road (Place 15 powered rails in a single connected minetrack path)
The Plug (Place blocks that stop the flow of 10 natural water/lava falls)
Farming Achievements:
Time to Farm (Build a hoe)
Delicious Fish (Catch a fish and cook it)
Bake Bread (make a piece of bread)
The Lie (Make a cake)
Walking Granary (Carry 5 stacks of wheat with you at one time)
Sugar Farmer (Farm 5000 blocks of sugarcane)
Fisherman (Catch 100 fish)
Reforester (Plant 100 saplings that eventually grow into trees)
Eat Healthy! (Heal 100 hearts with food that you made)
Good Idea. But alot of those achievements require a lot of dedication and materials like the Fortification, Part 2 (Build a wall 3 blocks high and 20 blocks wide out of bricks) and Fortification, Part 3 (Build a wall 3 blocks high and 20 blocks wide out of iron blocks)I understand where the ideas are comming from but i feel some of these are a bit over the top.
Make it something like Team Fortress 2 and categorize them, instead of having to complete one to be able to unlock another...
General achievements:
Benchmarking (Make a workbench)
Getting Wood (Get a piece of wood)
Taking Inventory (Open your inventory)
I Wish I Could Fly Right Up To The Sky (Reach the highest possible height)
World Traveler (Walk 100,000 blocks)
Triathlete (Walk, Swim, and Ride 5000 blocks by minecart)
Ice Skater (Walk 10,000 blocks on ice)
Extinguished (Walk into water while burning)
Base Jumper (Take 9.5 hearts of fall damage without dying)
Glider (Travel 25,000 blocks while airborne)
Scavenger (Pick up 10,000 items)
Warped (Travel through a portal)
When Pigs Fly (Ride a pig off a cliff)
(Under) World Traveler (Walk 10,000 blocks in the Nether)
Ultimate Minecrafter (Complete every other achievement)
Combat Achievements:
Time to Strike! (Make a sword)
Cow Tipper (Kill a cow)
Monster Hunter (Kill a hostile mob)
Creeper Conqueror (Kill 200 Creepers)
Skeleton Slayer (Kill 200 Skeletons)
Zombie Killer (Kill 200 Zombies)
Spider Hunter (Kill 200 Spiders)
Monster Murderer (Kill 1000 hostile mobs)
Warrior (Kill 1000 hostile mobs with a sword)
Marksman (Kill 1000 hostime mobs with a bow and arrows)
Dog Trainer (Have one of your tamed wolves kill a hostile mob)
The Minecraft Massacre (Kill every single NPC in a village)
Rumored Raider (Destroy a mob spawner in a dungeon)
Dangerous Dungeoneer (Destroy 10 mob spawners)
Champion Conqueror (Destroy 25 mob spawners)
GET OFF MAH LAWN (Kill a hostile mob that is within 10 blocks of a place where you destroyed a mob spawner)
THIS IS SPARTA!!! (Attack a mob and cause it to fall to its death)
UMADBRO? (Cause a hostile mob that was attacking another hostile mob to attack you)
Charged With Manslaughter (Kill a charged creeper)
Building Achievements:
Carpenter (Place 2000 wooden planks)
Hot Topic (Build a furnace)
Acquire Hardware (Get an iron ingot)
On A Rail (Build a rail)
Fortification (Build a wall 3 blocks high and 20 blocks wide out of cobblestone)
Fortification, Part 2 (Build a wall 3 blocks high and 20 blocks wide out of bricks)
Fortification, Part 3 (Build a wall 3 blocks high and 20 blocks wide out of iron blocks)
Trapper (Have a block that you placed kill a mob)
Busy Builder (Place 100,000 blocks)
Teleporter Goin' Up! (Build a portal)
Dispenser Goin' Up! (Build a dispenser and put food inside it)
Sentry Goin' Up! (Kill a mob with an arrow that was shot by a dispenser)
Diamond Ring (Place a diamond block)
Shipwright (Build 100 Boats)
Automotive Engineer (Build 100 Minecarts)
Road Builder (Place 1000 minetracks)
Automatic Road (Place 15 powered rails in a single connected minetrack path)
The Plug (Place blocks that stop the flow of 10 natural water/lava falls)
Farming Achievements:
Time to Farm (Build a hoe)
Delicious Fish (Catch a fish and cook it)
Bake Bread (make a piece of bread)
The Lie (Make a cake)
Walking Granary (Carry 5 stacks of wheat with you at one time)
Sugar Farmer (Farm 5000 blocks of sugarcane)
Fisherman (Catch 100 fish)
Reforester (Plant 100 saplings that eventually grow into trees)
Eat Healthy! (Heal 100 hearts with food that you made)