Achievement Unlocked

Completed the game

Guide
Chapters needed for unlocking:

Kong struck down

In the streets of New York - When prompted, press X once to start climbing up the Empire State Building.

The Empire State Building

Kong's Death

Credits

Once you've finished the game and watched or skipped the credits, this will unlock.

Jack used fire to scare off enemies and get out of harm's way

Guide
Chapters needed for unlocking:

The venture

Skull Island

Necropolis

Scorptions

Kong has imposed his supremacy over the inhabitants of the jungle

Guide
Chapters needed for unlocking:

The wall

Sacrifice

On Kong's tracks - The giant bird will grab Carl no matter what you do, so let it fly off with him

Hayes - This chapter will glitch if you enter the area with Hayes in it with the Thompson. If this happens to you, save and quit, enter KKsn1per in the cheats section of the main menu, then re-load. Hayes is glitching because you're equipped with the Thompson before you're actually supposed to have it, which seemingly prematurely triggers a sequence of scripted events.

V-Rex - In the boss battle, stand near the arch, get the dinosaur's attention by firing at it. When it approaches, shoot down the bird closest to you. When the dinosaur has eaten the bird, shoot it again to once again attract it's attention. When it's closing in, shoot the farthest bird, let the dinosaur eat it, then once again shoot the dinosaur for it's attention. Run around the arch to avoid getting struck by the dinosaur until Hayes and Carl has opened the door, then make a run of the opening.

Ann

Kong

V-Rexes got a taste of Kong's power!

Guide
Chapters needed for unlocking:

The canyon

Millipedes

Brontosaurus

Jimmy

On the raft

Rapids

Jack has protected his friends from getting harmed

Guide
Chapters needed for unlocking:

To save Ann

The cave

Venatosaurus

In the mud

Kong has killed numerous V-Rexes

Guide
Chapters needed for unlocking:

Fight

Swamps

Chased by V-Rex

The log

The Skull islanders

Jack used the foodchain system in order to escape certain death!

Guide
Chapters needed for unlocking:

Call Kong

Kong to the rescue

To the plane - There is another glitch on this level that happens frequently. If you get to the end of the area where the plane is docked near the shore, and Jimmy appears to be stuck or glitched on an upper ledge, it's because you are supposed to burn some grass in front of the plane. The grass is sometimes glitched as it is invisible, but it's still there. Grab a stick and light it on fire, run towards the plane until you are unable to proceed, then wave the burning stick into thin air. The grass will catch fire and start burning, making Jimmy come down from the ledge.

To the lair

Kong has killed the Giant Snakes

Guide
Chapters needed for unlocking:

Kong's lair

Fight in the lair

Kong has destroyed the village of the Natives

Guide
Chapters needed for unlocking:

Free!

Chased by Kong

Heading back

Back to the village

Kong's capture