Fill the Nitrous bar then use it all in one go without hitting anything

Bust a Racer at Heat 8 or greater

In Random Battles, destroy 50 airplanes with an anti-air gun

Finish A GREAT ESCAPE.

Attack and destroy a monster.

Craft and place a sign.

Turn wheat into bread.

Wear a full suit of Iron armour.

Smelt an iron ingot.

Use planks and sticks to make a pickaxe.

Craft a workbench with four blocks of wooden planks.

Punch a tree until the block of wood pops out.

GTA Online: You completed a Heist Setup mission.