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