Here is the full list of all 12 RogueCube achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
Unlock Ninja.
Defeat The Plant.
Unlock Beack.
Defeat Rufus.
Complete the Beach levels.
Spawn 20 times.
Hit an enemy returning a bullet with your melee weapon.
Play a daily run.
Spawn 10 times.
Complete a level without opening any chest.
Unlock Sam.
Kill your first enemy.