Here is the full list of all 30 DUSK achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Earn the 'Completionist' award in every level
Pick up a bar of soap in each level
Neutralize Chomper
Find Lavender's secret
Kill Intoxigator while intoxicated
Telefrag the Guardian
Get past wave 20 in Endless Mode
Reach E3MS
Reach E2MS
Find Dopefish
Find 'Wife of Intoxigator'
Find Rachael's secret
Earn the 'Untouchable' award
Use cheats
Beat a level on 'Duskmare'
Watch the credits to the end
Complete all three episodes
Complete episode 3
Earn the 'Pacifist' award
Complete episode 2
Kill an enemy by spinning your weapons
Earn the 'Low Tech" award
Beat par time in a level
Get past wave 10 in Endless Mode
Reach E1MS
Get past wave 5 in Endless Mode
Open Duskworld
Earn the 'Completionist' award
Complete episode 1
Find a "You aren't supposed to be here go away" sign