I search on achievement through this thread, but it seems nobody got them all yet. So these are the achievements i managed to find. One inbetween the two gardening ones i unlocked must be another gardening achievement. Ive tried harvesting plants just before they bloomed, ive tried planting, then overgrowing it once, then cutting it before it would bloom, I tried changing the weather a bunch of times, ive tried only one type only, but those didnt work.
I also found two more while testing some stuff (not depicted), are you dead or something (sleep 3 days straight), personality crisis (rename yourself in the menu (click on your bag).
I tried the same with scarlet (renamed her sister/mother/daughter/slave/son/father/lumberjack/guard), but whatever the keyword is, i couldnt find it. The hint ohro gives about seizing a bull by the balls instead of the horns doesnt seem to lead to anything (clicked on karos a bunch of times). Talking about karos, there is probably an achievement for getting to some late wave, but i got sick of it after wave 20. Maybe thats what 42 refers to?
edit: clicking the bug report button in the bottom left of the menu also gives you an achievement
edit2: clicking on the box inbetween are you dead and helping the community gives you another achievement.