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