Here is the full list of all 11 Wordabeasts achievements.
Submit a word with underscores
All players share the same name
Submit a word without vowels
Play over 20 full games of Wordabeasts
Play a game with the players "Shawn", "Justin" and "Eric" joined
Attempt to submit an emoji
Find something shiny
Submit a one-letter clue
Submit another player's name as your clue
Find alot
Use numbers in a clue