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