Here is the full list of all 38 Minion Masters achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Use 100 Power Tokens
Use 50 Resource Tokens
Complete 30 Achievements
Complete 50 Daily Quests
Craft a Legendary card
Complete 10 solo challenges
Create 3 decks
Win a Ranked battle with 8 different Masters
Craft a Supreme card
Complete 25 Daily Quests
Use 20 Resource Tokens
Craft a Rare card
Win 100 Ranked Battles
Acquire a collection of 150 cards
Win 50 Ranked Battles
Complete 5 solo challenges
Complete 15 Achievements
Complete 10 Daily Quests
Reach the Silver League
Use 25 Power Tokens
Watch a replay
Acquire a collection of 100 cards
Win a Ranked Battle with less than 100 Health left
Reach the Bronze League
Play 5 spells in a row during a Ranked Match and then win
Win against 8 different Masters
Complete 5 Achievements
Complete 3 Daily Quests
Win 10 Ranked Battles
Reach the Stone League
Win 3 Ranked Battles
Acquire a collection of 50 cards
Craft a Common card
Play a friendly challenge with 3 different friends.
Use 100 Resource Tokens
Use 250 Power Tokens
Win 500 Ranked Battles
Complete 100 Daily Quests