Harvest some leather.

Use a Green Chemical.

Defeat Infected Bat.

Complete the training facility.

Reverse a decision you made in an upgrade grid.

Obtain and equip a new personal vehicle.

Rebuild a Jumpship.

Play the piano using Rebecca.

Shoot down a Hunter or an Eliminator while they are jump attacking in the air.

Defeat Mimicry Marcus with a Molotov Cocktail or a Napalm Grenade.

Defeat Centurion.

Create a Molotov Cocktail.

Defeat Stinger.