Here is the full list of all 13 Of Frost and Flowers achievements.
Met the definitely not suspicious Isaiah.
Bargained with Keshir and bought Sol a gift.
Be a victim of Lithiel's mischief.
Read all books in Al’ Sharan’s library at one sitting.
Get Kisha's bad ending.
Get Sol’s bad ending.
Ate Lithiel’s signature silverbloom soup.
Met Terevska and Frosty.
Get Lithiel’s ending, and possibly get ownership to his entire forest…?
Get Sol's good ending.
Have Kisha rescue you from execution.
Have Sol rescue you from execution.
Get Kisha's good ending.