Don't you just hate escort missions?

Successfully complete an escort objective where all 4 NPCs survive.

See the Galaxy they said

Play at least once on a desert, a forest, and a snow planet.

Now that is what I would call a multi-kill!

Kill 7 enemies within a very short time using only your primary weapon.

Spreading Managed Democracy

Take part in a successful final assault on an enemy's home planet by completing at least one mission.

Next time we meet, I'll probably have to salute you

Achieve the rank of Captain (Rank 13).

No man left behind

Extract from a difficulty 8 or higher mission with 4 players where all 4 get on the shuttle.

Peace and prosperity reigns again

Complete at least one planet in a successful Galactic Campaign.

That which doesn't kill you, scars you for life

Finish the Training.

Liberating the countryside

Complete all missions on a planet with difficulty 10 or higher.

You're it until you die or I find someone better

Achieve the rank of Sergeant (Rank 7).

Defender of Humanity

Take part in a successful defense of a capital city by completing at least one mission.

Meet interesting people they said

Play at least once against all enemy races.

Brothers in Arms

Join another game through the matchmaking system.

The Helldiver's new clothes

Customize your character.

Join the Army they said

Complete a mission.

Nothing is hotter than a cup of Liber-Tea

Complete a volcanic type planet of difficulty 5 or more.

I'm no Zoologist, but how do you classify a 20 foot tentacle?

Face each new enemy once.

Make Frank kill a Tank!

Kill a Bug Tank, Bug Behemoth, or Cyborg IFV by having the extraction shuttle land on it.

It didn't SEE that coming!

Defeat an Illuminate Great Eye.

Resisting democracy is futile!

Defeat a Cyborg Siegemech.