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