Here is the full list of all 21 Drunk or Dead achievements.
Drink 1000+ litres of alcohol
Kill 5000 zombies
Kill 200 bosses
Kill 35 bosses
Alternate a shot of alcohol and headshot three times in a row
Try all kinds of alcohol in the first bar scene
You kept your drunk-o-meter between 2 and 6 for 4 minutes
You've harrassed the bartender
Kill 20 "french" zombies in a row.
Kill five zombies in a row while drunk over 6
You've played the piano
You've played the guitar
Simultaneously kill three zombies with a shotgun
Drink yourself to death
Kill 500 zombies
Kill 5 bosses
The Dancer Girl in Kinky Butts survives.
The Dancer Girl in Kinky Butts dies.
Make three headshots in a row
Reload for the first time
Kill 20 zombies