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