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Difficulty Key: Easy - Medium - Hard - Extreme - Super Amazing Insanely Difficult Stuff
This topic contains another 10 achievement suggestions (Technically another 12.. but who cares..)

Suggestion 11)
Dedicated! - Log into craftland every day for 14 days.
Lore: <3
Rewards: 10,000 Coins

Suggestion 12)
Master of Entities - Defeat a Superboss (Deal at least 10000 damage)!
Lore: You truly are the master of entities.
Rewards: 1,000 Coins + 1 Perfect Diamond Sword

Suggestion 13 [Superboss Slaying])
Here kitty kitty... - Take part in defeating a superboss ocelot (Deal at least 2500 damage)!
Lore: Smells fishy...
Rewards: 10,000 Coins + 10 Raw Fish
Iron Champ - Take part in defeating a superboss golem (Deal at least 2500 damage)!
Lore: Right... Where's the village..
Rewards: 10,000 Coins + 10 Iron Ingots + 1 Poppy
Bag of Bones - Take part in defeating a superboss skeleton (Deal at least 2500 damage)!
Lore: We've got a bone to pick and a jokebook to get a refund on (Mooshroom's idea)
Rewards: 10,000 Coins + 32 Bones + 1 Wither Skeleton Skull

Suggestion 14)
Too close for comfort... - As soon as you hit 1/2 a heart, find a way to max heal yourself within 3 seconds.
Lore: Indeed it was..
Rewards: 1 Golden Apple + 1 Bread

Suggestion 15)
Rolling in the money! - Roll in 1,000,000 Coins from Shop Chests.
Lore: Here's a coin, you have enough cash anyway.
Rewards: 1 Coin

Suggestion 16)
Monster Hunter - Slay every mob up to date!
Lore: This achievement will take effort.
Rewards: 50,000 Coins

Suggestion 17)
Nope. - Destroy a server boss whilst your remaining health stands at less than 2 hearts.
Lore: Just chuck testa.
Rewards: 25,000 Coins + 1 Blue Gummy Swet

Suggestion 18)
Come on... - Use bonemeal on 25,000 Crops!
Lore: This is taking forever...
Rewards: 10,000 Coins + 64 Bones

Suggestion 19)
The perfect set - Craft a Perfect Diamond Helmet, Chestplate, Leggings, Boots and Gloves
Lore: It's... so... shiny..
Rewards: 75,000 Coins + 5 Perfect Diamonds

Suggestion 20)
The knight in shining armors - Craft every single piece of armor on craftland!
Lore: Will you ever have enough armor?
Rewards: 250,000 Coins + 1 Perfect Diamond + 1 Diamond + 1 Gold Ingot + 1 Iron Ingot + 1 Leather + 1 Gravitite + 1 Zanite + 1 Valkyrie Medal

Love these, also loved the first one (#1). I believe not all of them will be possible though to add.

The skeleton one could get a better lore
Maybe something like, "We've got a bone to pick and a jokebook to get a refund on"

Fluttershy wrote: Suggestion 20)
The knight in shining armors - Craft every single piece of armor on craftland!
Lore: Will you ever have enough armor?
Rewards: 250,000 Coins + 1 Perfect Diamond + 1 Diamond + 1 Gold Ingot + 1 Iron Ingot + 1 Leather + 1 Gravitite + 1 Zanite + 1 Valkyrie Medal

I like this one. Would really be a good idea to implement.