Here is the full list of all 22 Knightin' + achievements.
No closed chest was left behind...
Obviously, found all the golden keys.
Defeated the generic dark lord.
Unique items? Collected'em all!
Great power may lead to unpleasant consequences (or not).
Big Red Potions... There is always not enough of them.
You won't believe how slimming this tough armor is.
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.
Point at your target. Shoot magic bolts. Try not to miss.
Simple dash isn't cool enough? How about a trail of flames?
Now you can move heavy things and open jars with bare hands!
Makes you invulnerable! But only after you were hurt...
Defeated almost a dragon.
Allows you to dash because walking is slow and boring.
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.
Finished the game under 90 minutes and without cheating.
Finished the game without dying even once and cheating.