Here is the full list of all 27 Core Awaken ~Jilelen and LittleSnow~ achievements.
Development cat form success
Stage 1 clear
Stage 2 clear
Development gaint robot complete
Stage 3 clear
Clear the main story
Clear difficulty Normal
Clear difficulty Hard
Clear difficulty Very hard
Clear difficulty No Future
Learn all magic element
Learn all magic track
Learn all Little Snow skill
Upgrade village level to 3
Collect 22 datas
Endless corridor reach to 50 floor
Collect all cat coin
Get a DNA with four ability
Unlock all character ability
Jilelen's cuteful LV.3
LittleSnow's lovely LV.3
Defeat Angel demon doll
Equip sage orb in item slot
Complete all village quest
Get all ruin items
Enhance Jilelen's body to maximum
Enhance LittleSnow's body to maximum