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