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