Here is the full list of all 25 Tess Elated achievements.
GET A PERFECT
GET A MEDIUM PERFECT
GET A HARD PERFECT
COMBO 5
COMBO 10
COMBO 15
COMBO 25
COMBO 50
BEAT EASY MODE
BEAT MEDIUM MODE
BEAT HARD MODE
BEAT EASY IN UNDER 30 MINS
BEAT MEDIUM IN UNDER 45 MINS
BEAT HARD IN UNDER 1 HOUR
BEAT EASY WITH LESS THAN 100 MISTAKES
BEAT MEDIUM WITH LESS THAN 250 MISTAKES
BEAT HARD WITH LESS THAN 500 MISTAKES
UNLOCK THE FIRST SKILL
UNLOCK EVERY FIRE SKILL
UNLOCK EVERY PLANT SKILL
UNLOCK EVERY HEART SKILL
UNLOCK EVERY STAR SKILL
UNLOCK EVERY ICE SKILL
UNLOCK EVERY SKILL
COMPLETE ALL ACHIEVEMENTS