Serious Sam Classics: Revolution achievements

Mess with the gravity for a total of 60 minutes.

Kill less than 8 enemies on the first level of The Second Encounter in at least normal difficulty.

Get the gold medal on the Christmas 2014 survival level.

Finish the first level of The Second Encounter taking no damage in at least normal difficulty.

Complete a level in The Second Encounter using only the knife on at least normal difficulty.

In a match of at least 6 players, run 2 kilometers without getting killed.

Finish the first level of The Second Encounter without jumping in at least normal difficulty.

Find a secret Minelayer in The Second Encounter.

Using explosive weapons, kill 10 people in a row.

Find a secret bouncing rock.

Finish The Second Encounter in cooperative.

Finish The Second Encounter on single player.