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