Here is the full list of all 30 Tendryll achievements.
Be affected by 6 Banes on one turn.
Have 6 cards with Runes in any deck.
Survive 10 Anomalies.
Beat the game.
Beat Ascension 1.
Beat Ascension 2.
Beat Ascension 3.
Beat Ascension 4.
Beat Ascension 5.
Beat Ascension 6.
Beat Ascension 7.
Beat Ascension 8.
Beat Ascension 9.
Beat Ascension 10.
Play 15 cards on one turn.
Deal 125 damage with a single hit.
Permanently upgrade 15 cards.
Defeat 1 boss without any hero losing health.
Defeat 2 bosses without any hero losing health.
Defeat 3 bosses without any hero losing health.
Heroes increased their max hp by 20.
Generate 7 Flash on one turn.
Defeat 6 elite combats.
Kill 8 Skitterbugs.
Kill 3 enemies with one card.
Replace all of your starting Move cards.
Be affected by 2 Anomalies at the same time.
Win a common combat on your first turn.
Win an elite combat on your first turn.
Win a boss combat on your first turn.