Duke Nukem 3D

Piece of Cake
Reward: 25 Points
Objective: Complete "L.A. Meltdown" on any difficulty or in co-op.

Let's Rock
Reward: 25 Points
Objective: Complete "Lunar Apocalypse" on any difficulty or in co-op.

Come Get Some
Reward: 25 Points
Objective: Complete "Shrapnel City" on any difficulty or in co-op.

Game Over
Reward: 25 Points
Objective: Complete "The Birth" on any difficulty or in co-op.

Duke's Mighty Foot
Reward: 10 Points
Objective: Step on 40 enemies after using the Shrinker on them.

Looks Like Cleanup on Aisle 4
Reward: 10 Points
Objective: Step in a pile of excrement.

Shake It Baby
Reward: 10 Points
Objective: Tip an exotic dancer.

Oomph, Uugh, Where is it?
Reward: 10 Points
Objective: Find 70 secret areas.

Alien Maggots are Gonna Pay
Reward: 10 Points
Objective: Finish the "Hollywood Holocaust" level in under 3 minutes.

Multiplayer:

Gonna Rip Em' a New One
Reward: 10 Points
Objective: Get 100 total kills in ranked Dukematch games (Online).

See You in Hell
Reward: 15 Points
Objective: Get 250 total kills in ranked Dukematch games (Online).

Hail to the King, Baby
Reward: 25 Points
Objective: Earn respect and get 500 total kills in ranked Dukematch games (Online).