Here is the full list of all 16 God Damn The Garden achievements.
Get killed lol
Don't kill any talkative animals.
Beat game in 15 mins.
Kill Tim before killing Santa's Idiot
Kill Nameless Crap.
Kill George before killing Tim
Kill 250 small spiders.
Kill 500 small spiders.
Kill 1000 small spiders.
Kill a big spider.
Kill the Capybara.
Secret path!!
Complete the game without taking damage.
Gather all skull collectibles.
Beat the game.
Kill all talkative animals.