Real ultimate and That Stings Description: Do 2500 damage or more with a single Ninja attack. / Do 2000 or more damage with a single attack.
How to do: The best idea is to do this 2 achievements at the same time. Just use a ninja, equip it with the sword and overcharge. Then move the ninja to a Sword marked square (it has to have a crystal beside it, map random requierement) and attack the crystal.
[Bad disease] Description: Lower an enemy's maximum health by 250 with a Monk.
How to do: Attack with the monk any enemy with at least 1000 points of health (Heavys, Knights with buff...).