Here is the full list of all 30 DUSK achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Telefrag the Guardian
Kill an enemy by spinning your weapons
Reach E1MS
Use cheats
Complete all three episodes
Complete episode 3
Get past wave 10 in Endless Mode
Get past wave 5 in Endless Mode
Complete episode 2
Earn the 'Completionist' award
Open Duskworld
Complete episode 1
Earn the 'Pacifist' award
Earn the 'Untouchable' award
Earn the 'Low Tech" award
Beat par time in a level
Beat a level on 'Duskmare'
Find a "You aren't supposed to be here go away" sign
Earn the 'Completionist' award in every level
Find Rachael's secret
Find Lavender's secret
Pick up a bar of soap in each level
Get past wave 20 in Endless Mode
Watch the credits to the end
Find Dopefish
Find 'Wife of Intoxigator'
Reach E3MS
Reach E2MS
Kill Intoxigator while intoxicated
Neutralize Chomper