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
Earn the 'Completionist' award in every level
Find Lavender's secret
Use cheats
Reach E3MS
Get past wave 20 in Endless Mode
Get past wave 10 in Endless Mode
Get past wave 5 in Endless Mode
Watch the credits to the end
Complete episode 3
Complete all three episodes
Open Duskworld
Complete episode 2
Telefrag the Guardian
Find 'Wife of Intoxigator'
Reach E2MS
Find Dopefish
Kill Intoxigator while intoxicated
Reach E1MS
Find Rachael's secret
Beat a level on 'Duskmare'
Earn the 'Untouchable' award
Earn the 'Pacifist' award
Earn the 'Low Tech" award
Beat par time in a level
Complete episode 1
Earn the 'Completionist' award
Find a "You aren't supposed to be here go away" sign
Kill an enemy by spinning your weapons