Import Steam Save Game...
	Start with Insane difficulty...
	Various Steam Achievements...

When starting the first time, you get ask if you want to Import them. If you missed it, you can go under Options -> Extras -> Import save data to open the dialog again. The "Import save data" option is only there, when the game found save data from the steam version in the correct folder.

When import an old finished save game, you receive these three unlocks. So you can start a new game in any difficulty with all of it. After you imported your completed save game, you need to restart the game, to actually have the options Insane difficulty / Reconstructor / Golden Hammer.

Complete the indicated task to unlock the achievement.

Achievement	How to unlock
A Greater Purpose	Complete Redemption.
Ares' Bloodlust	Destroy the 4 Marauder War Totems.
Battle Scarred	Earn 10,000 XP in Multiplayer.
Best Friends Forever	Kill 100 EDF with the sledgehammer during the Campaign.
Bound By Blood	Complete Rescue.
Broken Supply Line	Destroy 250 EDF supply crates.
Can't Get Enough	Play every mode on all maps in Wrecking Crew.
Check Your Map	Finish a match on every map in Multiplayer.
Clean and Righteous!	Destroy 5 High Importance targets.
Coming Down!	Destroy 50 EDF owned buildings.
Coup D'etat	Liberate Eos Sector.
Death From Above	Liberate Dust Sector.
Deliverance Defender	Complete Marauder Actions.
Detective	Complete 8 hidden challenges in Multiplayer.
Disaster Area	Destroy 1 billion credits worth of EDF property.
Doing Your Part	Kill 10 enemies in a Matchmaking Match.
Don't Tread On Me	Liberate Oasis Sector.
Doozer	Reconstruct a Damage Control target.
Experimenter	Complete 4 hidden challenges in Multiplayer.
Family Vengeance	Complete Retribution.
Field Tested	Earn 1,000 XP in Multiplayer.
Free Your Mind	Destroy all instances of propaganda.
Freed Space	Destroy 50 EDF flyers.
Freedom Fighter	Complete 50 Guerrilla Actions.
Friendly Skies	Liberate Badlands Sector.
Got Any Fingers Left?	Beat all Pro times in Demolitions Master.
Grab Some Popcorn	Enter Spectator mode and enjoy the show!
Guerrilla	Complete 25 Guerrilla Actions.
Insurgent	Complete 5 Guerrilla Actions.
Jack of all Trades	Score 10 kills while wearing each backpack.
Juggernaut	Destroy a Siege target.
Just the Beginning	Win a Matchmaking match.
Lost Memories	Locate all missing radio tags.
Mad Genius	Complete 16 hidden challenges in Multiplayer.
Martian Tea Party	Complete 2 missions for the Red Faction.
Mobile Bombs	Destroy 100 EDF vehicles.
One Man Army	Complete 25 killing sprees during the Campaign.
Party Time	Play all Wrecking Crew modes once.
Power to the People	Raise the Morale of 3 sectors to 100%.
Purge the Valley	Break the EDF Control of the Mariner Valley.
Red Dawn	Liberate Mars.
Red Faction Guerrilla Re-Mars-tered	Unlock all Achievements in Red Faction Guerrilla Re-Mars-tered
Revolutionary	Complete all Guerrilla Actions.
Spread the Word	Liberate Parker Sector.
Start of Something Special	Play 5 Matchmaking matches.
Structural Integrity	Destroy all Medium and High Priority Targets in Mariner Valley.
Tank Buster	Blow up 100 small hydrogen tanks.
The High and Mighty	Kill a flying opponent using a remote charge stuck to them.
The Power of One	Collect 75 Marauder Power Cells.
Tools of the Trade	Score a kill with every weapon in Multiplayer.
Topher Would Be Proud	Play 250 matchmaking games.
Try Anything Once	Finish a match in every mode.
Tumbling Down	Beat all Pro times in Mariner Valley Demo Masters and Transporters.
Warp Speed	Beat all Transporter Pro times.
Welcoming Committee	Complete the Tutorial mission.
Working the Land	Mine all ore locations.
Wrecking Ball	Score 25 million points worth of destruction in Wrecking Crew.