Congrats! You've started digging your first fortress!

Cut down a tree & make logs.

Have a Forester plant a seedling.

Slaughter a Goblin.

Recruit a Knight.

Drop a Throne blueprint.

Drop an Altar blueprint

Have no Dwarrow alive

Win a map by finding the Arkenstone deep within the ground.

Your Queen is dead, her lineage ended. Shuffled off her mortal coil, to encounter darkness, and rot away.

Have one of your Knights send a demon back from whence it came.

Train and equip a plague doctor to combat the foul miasma.