Have 2 available engineers. Take one and start making a structure (preferably something which costs a lot of mass). Then with the other engineer click repair on the building while it is being built. Right after you do that, click reclaim with the same engineer on the structure while it is building. The building's health should stop at a certain point and it will give you extra mass. You can do ass many mass glitches as you can do.
Unit Production Speed Up
First you'll need any factory. (land, air, or naval). Then you'll need to start training multiple engineers. After you train multiple engineers (recommend: 10) order them to guard/assist near the factory, NOT ON IT! Helps create multiple experimentals faster.
ACU Point Defense
You have to build at least 7 to have it work. Make your acu head start them but don't complete them, have your enginers work on them.
Increase Transports Capacity
The standard transports for the UEF and the Illuminate can increase their transport capacity by ten it can only be done by researching it.
Each faction has the capability to use nuclear missiles at nuclear facilities. Usually the are two different nuclear facilities, one launches the nukes and one defends you from nukes. But for the Cybran instead of two nuclear facilities they just have one which can both launch nukes and destroys nukes.
The Loyalty Gun is an experimental structure that can only be built by the illuminate. What it does is basically capture enemy units in a certain radius for you to command.
Speed It Up
The engineers can do more than build structures. They can also speed up the rate at which your units are built.
The experimental transports for the UEF and Cybran can carry two experimental units at a time but it can only do this for the Fatboy 2 (UEF) and the Megolith 2 (Cybran).
There are a lot more experimental units in supreme commander 2 then in the first one. In the first one there were only three per faction, in the second one there are eight per faction.
There is an ability called hunker that can be used by the ACU. What it does is reduce the damage the ACU takes but it disables all ACU functions and movement.
You'll have to complete appropriate achievement to get the allotted gamerscore.
Supremest Commander(100) - Complete all three campaigns on 'Hard' difficulty
Knows it All(25) - Complete all primary and secondary campaign objectives
A Winner is You(75) - Complete all three campaigns 'Normal' difficulty
Score Hoarder(50) - Get a complete campaign score over 150,000
Time Cruncher(50) - Play the game for over 24 hours in total
Supreme Online Commander(50) - Win 25 Ranked Matches
To the Victor...(25) - Win 25 skirmish or online matches
Easy Going(25) - Complete all three campaigns on 'Easy' difficulty
Completist(25) - Complete all hidden campaign objectives
Sharp Shooter(25) - Destroy 10,000 units
Masster(25) - Extract 1,000,000 mass
Master Builder(25) - Build 10,000 units
Rodgers is Relievedis (25) - Complete the 'End of an Alliance' operation
Reunited(25) - Complete the 'Prime Time' operation
Terra Firma(25) - Complete the 'The Final Countdown' operation
Committed Relationship(25) - Play 25 skirmish or online matches with one faction
Sightseer(20) - Win a skirmish or online match on every multiplayer map
Good Game(20) - Win a skirmish or online match against all AI opponents
Good Friends(20) - Win 10 co-op matches vs AI
Gorged(20) - Complete the 'Cliff Diving' operation
Bugs in the Systemthe (20) - Complete the 'The Trouble With Technology' operation
Class Reunion(20) - Complete the 'Gatekeeper' operation
Dating(15) - Play 10 skirmish or online matches with one faction
Fatboy Parade(15) - Complete the 'Titans of Industry' operation
Nuclear Strike(15) - Complete the 'Factions or Family Plan' operation
Prison Break(15) - Complete the 'Back on the Chain Gang' operation
Hole in the Ground(15) - Complete the 'Steamed' operation
Bot Lord(15) - Complete 'Prime Time' with an army made up entirely of Assault Bots
Survivalist(15) - Survive multiple waves after the download completes in 'Fact Finder'
Well Stocked(15) - Complete the 'Surface Tension' operation
Luddite(10) - Win a skirmish or online match without building any Experimentals
Start Here(10) - Complete both parts of the tutorial
Rushin' Front(10) - Win a skirmish or online match in less than five minutes
Sampling(10) - Win a skirmish or online match with each faction
Internet Commander(10) - Win an online match
Friends(10) - Win a co-op match vs AI
Ranker(10) - Win a Ranked Match
Communication Breakdown(10) - Complete the 'Prime Target' operation
Second Target(10) - Complete the 'Off Base' operation
Deep Freeze(10) - Complete the 'Strike While Cold' operation
Barge Ahead(10) - Complete the 'Delta Force' operationthe
Alarming(10) - Complete the 'Lethal Weapons' operation
Downloading(10) - Complete the 'Fact Finder' operation
Animal Magnetism(10) - Complete the 'The Great Leap Forward' operation
Survivor(10) - Don't lose any units during the first attack in 'Prime Target'
Replayer(5) - Improve your score on any operation
Cakewalk(5) - Win a skirmish or online match against any AI opponent