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