Here is the full list of all 30 Babble Royale achievements.
Die on your starting letter
Kill 1 opponent
Reach level 5 in one game
Survive 1 game
Survive 10 games
Survive 100 games
Enter a Golden Royale
Win a Golden Royale
Make a seven letter word
Make an eight letter word
Make a ten letter word
Kill 100 opponents
Kill 1000 opponents
Kill 10000 opponents
Survive 1000 games
Kill 3 opponents in one game
Kill 5 opponents in one game
Kill 10 opponents in one game
Reach level 8 in one game
Reach level 10 in one game
Reach level 12 in one game
Reach level 15 in one game
Make the word "BABBLE"
Make the word "ROYALE"
Make the word "ACHIEVEMENT"
Kill 2 opponents with one play
Kill 3 opponents with one play
Kill with your first word
Take 200 damage from the Hot Zone in one game
Survive a game with zero kills