Alright, seeing as there are apparently no threads on mission tips right now, I thought I might as well start one.

The purpose is simple: post tips on how to survive and/or get high scores for each mission. Even better if you've got videos to show it off :-)

Here's mine for Mission 1:

Unit: Apex Fighter
Guns:
- Small Plasma Gun / Crew 500ep
- Light Machine Gun / RPE 75mm Pd
Missiles:
- Swarm Missile / S2SSCM Swarm *
- Swarm Missile / S2SSCM Swarm *
- Rocket Pods / BFRPCM Titan
* Initially not available

Mission time: 6mins 31s
Total score: 51975pts (Platinum)
Video (Youtube): /watch?v=ImzzbSukyxA

Tips:
- IMHO, you need swarm missiles to get Platinum here; the fighter missile takes long to aim and travel, which makes it time inefficient (and it also tends to miss when shot from a long distance)
- Spend the least time on the firing range / debris field; destroy the wreckage quickly using rocket pods
- Destroy as many wreckage as you can (but without sacrificing time) - this can make or break your shot at the Platinum medal
- When fighting against enemy units, use light machine guns to quickly deplete their shields
- It only takes 2 packs(?) of swarm missiles to take down an enemy unit with depleted shields
- Machine gun bullets travel faster than swarm missiles; if you can time it right, you could take down an enemy unit faster by shooting 2 packs(?) of swarm missiles from mid distance (about 1 - 1.5 km away) and then get in close with light machine guns

Will post more soon :-)

Now, if anyone could provide some tips for mission 3 and how to unlock the upgrade there, that would be awsome.

The problem is how to beat the corvettes without letting any torpedo reach the carrier spaceship.

You do those challenges on a replay with a different ship (preferably a Strike Suit).

IIRC, I pulled the difficulty down, and equipped a Raptor Strike Suit. The SS-Shotgun doesn't pierce capital ship armor, but it sure does reduce their lifebars quick. I did it that way IIRC.

Thank you!