Resogun was a PS4 Launch title that was free for  members. Many considered this the best PS4 game at launch, a launch that included Killzone Shadow Fall.  I would agree. This game doesn’t require you to play co-op, however, 1CC will be made much easier with a co-op partner. 1CC requires you to beat arcade mode (from the beginning) on experienced difficulty without losing all your lives. With a co-op player, if you do lose all your lives, you will respawn at the beginning of the next level if your partner completes the level. Saving the humans aren’t required, but there are certain humans that provide you with either an extra life or with a bomb. Those humans are:

Acis:

• Bomb – #8
• Life – #10

Ceres:

• Bomb – #7
• Life – #8 (must kill keepers in specific order)

Decima:

• Bomb – #4 (must kill keepers in specific order)
• Life – #7 (must kill keepers in specific order)

Febris:

• Life – #2 (must kill keepers in specific order)
• Bomb – #7

Mefitis:

• Life – #7
• Life – #10 (must kill keepers in specific order)

For further information, you can watch this 1CC video where I partner up with CrAzYmAN14. I get a lot of requests to help others, and I wish I could. If you need to find a partner, ask in the comments below.

1CC

You will also need to save all the humans on each of the levels. Many of them will require you to destroy all the keepers, some will require you to destroy the keepers in a specific order and others will require you to be at a specific multiplier at a specific point in the level.

Savior of Acis

Savior of Ceres

Savior of Decima

Savior of Febris

Savior of Mefitis

If you have 1CC and all the Humanist trophies, you should only have one or two trophies left. One of them is for completing one level on Master difficulty. You unlock Master difficulty by completing the game on Veteran (Co-op won’t unlock it). You can find someone who has Master difficulty unlocked already and complete a level with them, or just complete Veteran on your own. The difference on Master is that enemies will shoot back a projectile every time you destroy them.

You may also be missing one of the following trophies, so just use these videos to help you clean up any remaining trophies

How Do I Stop This Thing

Kill 50 enemies with one boost

Micromanagement

Save two humans within a span of one second

(10+1.5+3.5)x

Get a multiplier of 15x

O to the D

Kill 100 enemies during Overdrive