Here is the full list of all 19 Knightfall: Rivals achievements.
Upgrade your cards 50 times.
Win 10 total battles in either Casual Battles.
Upgrade your cards 10 times.
Open 15 total chests.
Play the game for 5 days.
Unlock 50 total cards in your collection.
Unlock 20 total cards in your collection.
Complete the tutorial.
Win 50 total battles in either Casual Battles.
Win 300 total battles in either Casual Battles.
Win 10 total battles in either Ranked Battles.
Win 50 total battles in either Ranked Battles.
Win 300 total battles in either Ranked Battles.
Unlock 300 total cards in your collection.
Play the game for 30 days.
Play the game for 90 days.
Upgrade your cards 300 times.
Open 30 total chests.
Open 100 total chests.