How can I complete these left achivements 
It's a bit complicated, both require you to be in celestial form when Glace is present. The first, you have to give up when fighting her while in your celestial form. The second, you have to be wearing her armor and have her take control while you're in celestial form. (That means her body compatibility must be smaller before the fight starts, but larger before the fight is over.) Who you're fighting doesn't make a difference. I recommend finding a strong enemy that doesn't do much damage to you. Then make sure you have the ring of health regen (or its associated perk) and pass the time in celestial form. Maybe I have those backwards.