This is the best I could do. top to bottom.
Line 1:
Beginning: after talking to innkeeper and getting first orb;
Ten Holes: no idea how to get. Tried to keep killing chimera at garden tower to activate the tree eye more than 10 times, no success;
Combo master: chain 5 combos on normal attack;
Fame: see credits on achievements menu;
Overpowered: level 200;
Catch them all: unlock all gallery scenes;
Line 2:
End is near: after getting lava orb for first time;
Golden Medallion: couldn't unlock;
The end: finished game once;
Now you know: ironically, I have no idea, so I don't know;
Divine hero: end game on hard mode;
4th line (3rd must be empty, I don't think I missed so many achievements):
House sitter: spare fox;
YOU ARE MURDERER: don't;
The end?: finished game with any of 3 endings;
Trick: see innkeeper's scene;
True Divine Hero: suppose it was finishing last battle without input errors;
5th line:
Seriously?: input talk command during naga battle;
Tricked: given medallion to innkeeper in exchange of unlimited pots/tavern rights.
Now: how the fk to open "ten holes", "now you know", last spot on 2nd line, last spot on 4th line, and 4 last spots on 5th line?
Okay, ten holes was actually obvious. stay in battle until 10 h scenes show up, you get the achievement on 10th one, so no need to keep counting.
Still trying to understand Now you Know, because I still don't.
I'm officially out of trying to know. The achievement icon is obviously representing the large moray or whatever it is which swims in two of the water tower rooms:
However, no matter what I try, nothing happens. Most likely it would emerge from the fountain room, but nope, also doesn't happen.
Therefore, I've given up of knowing, good game and goodbye for this.