Here is the full list of all 67 Crystal Maidens achievements.
Upgrade 30 legendary items to the level 5
Upgrade 10 legendary items to the level 5"
Find 10 legendary items in the Campaign Mode
Upgrade 1 legendary item to the level 5
Upgrade 30 epic items to the level 5
Find 5 legendary items in the Campaign Mode
Lose 500 battles
Upgrade 10 epic items to the level 5
Play 500 battles with Engineer class
Play 500 battles with Support class
Upgrade 1 epic item to the level 5
Lose 100 battles
Upgrade 30 rare items to the level 5
Play 100 battles with Warrior class
Find a legendary item in the Campaign Mode
Lose 50 battles
Upgrade a building up to level 10
Earn 1 million coins in Campaign Mode
Play 500 battles with Marksman class
Upgrade 10 rare items to the level 5
Upgrade 1 rare item to the level 5
Upgrade 30 common items to the level 5
Play 500 battles with Mage class
Upgrade a skill to the level 20
Get a hero up to level 60
Play 100 battles with Engineer class
Romance 15 maidens to level 3
Play 15 days in a row
Play 50 battles with Engineer class
Upgrade 10 common items to the level 5
Upgrade 1 common item to the level 5
Earn 250.000 coins in Campaign Mode
Play 7 days in a row
Earn 180 stars in Campaign 1
Upgrade a building up to level 5
Kill 1000 enemies in battle
Play 50 battles with Warrior class
Win 50 battles with all 3 stars
Play 100 battles with Support class
Play 100 battles with Marksman class
Get a hero up to level 30
Own 15 maidens
Complete level 60 of Campaign Mode
Earn 120 stars in Campaign 1
Win 20 battles with all 3 stars
Play 50 battles with Support class
Play 50 battles with Marksman class
Play 100 battles with Mage class
Kill 250 enemies in battle
Complete level 30 of Campaign Mode
Romance 5 maidens to level 3
Upgrade a building up to level 2
Upgrade a skill to the level 5
Earn 60 stars in Campaign 1
Play 50 battles with Mage class
Kill 100 enemies in battle
Earn 5000 coins in Campaign Mode
Win 5 battles with all 3 stars
Get a hero up to level 10
Complete 10 quests
Complete 50 quests
Complete 200 quests
Own 10 maidens
Romance 2 maidens to level 3
Own 5 maidens
Complete level 1 of Campaign Mode