Full list of all 28 Windowkill achievements.
The base game contains 22 achievements, and there is 1 DLC pack containing 6 achievements.
collect a 1000+ value coin
get lv. 10 multishot
hold 8 stars at once
survive for 2 minutes without shooting the window as bastion
kill ???
kill 10 spikers
survive for 20 minutes
get 40,000 coins in one run
kill every boss
have 50 health
buy 100 shop items
?
beat timed mode
obliterate a star
get lv. 4 halt
kill an orb array as zephyr
kill 98 bosses
manifest 50 items
beat timed mode as :)
unlock everything
get a x4 multiplier
survive for 4 minutes without collecting a coin
get lv. 4 detach
kill wyrm without causing a split
kill 2 bosses at once during halt
block 200 bullets
die to slime trail