Here is the full list of all 21 Porndle achievements.
Obtain All Achievements
Unlocked all Images in the base pack
Win your first Game
Win 25 Games in Infinite Mode
Win 50 Games in Infinite Mode
Win 100 Games in Infinite Mode
Win 7 'Word of the Day' Games
Win 21 'Word of the Day' Games
Have 10 'Word of the Day' consecutive wins
Have 20 'Word of the Day' consecutive wins
Have 25 'Infinite Mode' consecutive wins
Have 50 'Infinite Mode' consecutive wins
Win 2 games in 2 words
Win 3 games in 3 words
Win 4 games in 4 words
Win 5 games in 5 words
Win a game in 6 words
Find a word with 2 of the same letter
Play 200 Games
Lose a game with 4 letter found
Customize the Jukebox