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