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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hold 8 stars at once
kill ???
get a x4 multiplier
kill 98 bosses
get lv. 10 multishot
collect a 1000+ value coin
kill an orb array as zephyr
have 50 health
survive for 2 minutes without shooting the window as bastion
get 40,000 coins in one run
kill 10 spikers
beat timed mode
buy 100 shop items
kill every boss
survive for 20 minutes
obliterate a star
get lv. 4 halt
manifest 50 items
beat timed mode as :)
unlock everything
block 200 bullets
kill wyrm without causing a split
survive for 4 minutes without collecting a coin
get lv. 4 detach
kill 2 bosses at once during halt
die to slime trail