Here is the full list of all 22 Knightin' + achievements.
Big Red Potions... There is always not enough of them.
Defeated the generic dark lord.
Great power may lead to unpleasant consequences (or not).
Defeated the master of mucus.
Sends projectiles back where they came from. That's mean.
Secret hold-attack-button-to-charge technique unlocked.
Ought to teleport to other worlds. But teleports to other rooms.
Defeated the unfinished titan.
Simple dash isn't cool enough? How about a trail of flames?
Point at your target. Shoot magic bolts. Try not to miss.
Now you can move heavy things and open jars with bare hands!
Defeated almost a dragon.
Allows you to dash because walking is slow and boring.
Makes you invulnerable! But only after you were hurt...
Place it in front of anything dangerous. It's as simple as that.
Swing it towards your foe. Haven't won yet? Repeat previous step.
You won't believe how slimming this tough armor is.
Unique items? Collected'em all!
No closed chest was left behind...
Obviously, found all the golden keys.
Finished the game under 90 minutes and without cheating.
Finished the game without dying even once and cheating.