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
get lv. 4 halt
get a x4 multiplier
collect a 1000+ value coin
kill ???
get lv. 10 multishot
survive for 2 minutes without shooting the window as bastion
beat timed mode
kill 10 spikers
get 40,000 coins in one run
survive for 20 minutes
have 50 health
buy 100 shop items
kill every boss
?
obliterate a star
kill an orb array as zephyr
manifest 50 items
beat timed mode as :)
unlock everything
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