Here is the full list of all 19 Dust & Neon achievements worth 1,000 gamerscore.
Beat boss 1
Beat boss 2
Beat boss 3
Beat boss 4
Beat boss 5
Beat boss 6
Rebeat all bosses 3 times
Upgrade 6 skills
Upgrade 12 skills
Upgrade 18 skills
Upgrade 24 skills
Reload 25 bullets
Reload 100 bullets
Reload 250 bullets
Reload 500 bullets
Find 10 weapons
Find 50 weapons
Find 100 weapons
Find 200 weapons