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