This isn't anything big, just a little thing to add that might make the game more enjoyable. I'll list a few ideas for achievements down below.
Eye for an Eye - Defeat the Deerclops.
Master Cook - Create every crock pot recipe at least once.
Chubby Buddy - Successfully tame a Beefalo with the Pudgy typing.
Making Science - Create a science machine/alchemy engine for the first time.
Do You Have the Time? - Survive 100 days in a single world.
Who Let the Dogs Out? - Experience 25 separate hound attacks.
Life Saver - Revive a player for the first time.
Bug Guts and Glory - Kill a total of 10,000 insects.
Welcome Home - Adopt a pet for the first time.
Fashion Show - Dress up a character with a different cosmetic at least once.
Not Starving - Reach day 20 without reaching 0 hunger or dying.