Here is the full list of all 18 Aldred Knight achievements.
You died at least once
Do you have an ax
Do you have an arrow
You killed the GigantBeetle
You kill the witch
You finished the game
Collet coins undetermined times
kill enemies undetermined times
Take keys undetermined times
Save hostages undetermined times
Destroy undetermined times
Jump undetermined times
Pull levers undetermined times
Go down undetermined times
Drink potion undetermined times
Turn to gold form undetermined times
Fall on thorns, undetermined times
Enter in water