Collect all the Trophies
Complete the Game
Complete the Game in Crushing mode
Find 5 treasures
Find 35 treasures
Find all the treasures
Ask Skeleseer a question
Inspect the bottom of the Strange Skull treasure that you can find near the end of Chapter 8.
Find a Hoysala token
Any one of the eleven tokens you can find in Chapter 4 will do.
Find all the Hoysala tokens and obtain the Queen's Ruby
Open 5 lockboxes
Open every lockbox
Take a photo at 5 photo opportunities
Take a photo at all the photo opportunities
Listen to all optional conversations
Use every gun in the game
There are 24 guns to fire in this game, nothing particularly tricky or hidden but here's a list of them and the first place I encountered them:
The Turret and DShK are not part of the Extras > Bonus > Add-Ons > Weapons list but do count towards this total.
Defeat an enemy with the last bullet in your handgun clip
Defeat 10 enemies with headshots in a row
Defeat 5 consecutive enemies with the silenced pistol without being detected
Being detected in this instance includes enemies seeing the dead bodies of their friends.
Defeat 20 enemies firing from-the-hip
This includes firing from behind cover.
Defeat 20 enemies blind-firing from cover
Stealth take-down 10 armored enemies with melee by first removing their helmets without being detected
This is where you jump on the back of an armoured enemy, Triangle tap to remove his helmet and then melee attack him again without setting off an alert.
Defeat 20 enemies with C4
C4 appears during the APC Fight in Chapter 6 and the Helicopter Fight in Chapter 8. If you Encounter Select make sure to Reset Encounter before the end to keep your cumulative stats as they'll just reset to zero otherwise.
Mark 30 enemies
Marking enemies is not possible in Crushing difficulty.
Open a lockbox with enemies nearby
The Helicopter Fight in Chapter 8 is a good place for this one.
Defeat 4 enemies with one C4 detonation
Easiest location I found was the truck that arrives at the end of the APC Fight in Chapter 6. Blow up the APC and then quickly plant a charge on the rocks where the truck appears.
Stealth take-down 15 enemies in a row
Break stealth and re-enter stealth successfully
Perform 10 combo partner takedowns
Make it to the outskirts of Halebidu in Chapter 5 without using a firearm or explosive
This only requires you to replay Chapter 3 and Chapter 4, you'll get it as you start to walk towards the dam at the start of Chapter 5.
Defeat 5 enemies, each one taking damage from a handgun, long-gun, and melee
Just watch out for Nadine's "help" when doing this. One bullet will suffice as damage (just don't shoot them in the head).
Defeat enemies with the vehicle, long-gun, melee, and grenade, in that order, in 20 seconds
Chapter 3 and 4 are the places to try this. I did it at the Forest Outpost by first marking the enemies from afar before driving in.
Defeat 30 enemies with gold weapons
Defeat 4 enemies with the vehicle in 20 seconds
I also did this at the Forest Outpost by marking enemies from afar so it's easier to target them with the car.
Use all the zip-lines to traverse the city
This is in Chapter 2 during the escape from Asav. Just after the melee fight is a zipline along the left path that is possible to miss. You'll get the trophy upon zipping down the last zipline into the river.
Appreciate the view at the top of the Hoysala Empire
After opening all of the doors in the elevator room you can climb up one of them to continue going up. Wait at the top balancing for a while.
Drive from the Ganesh mountain carving to the top of the waterfall at the Trident Fort and back in under 3 minutes
That's the relief that the three fortresses activate, you get up there via a root bridge.
Get through all 3 Axe Fort trials without resetting any boards
Trial 1: Forward, Forward, Right. Forward, Left, Back. Forward, Left, Forward. Forward.
Trial 2: Forward, Right, Left. Forward, Left, Forward. Left, Forward, Right. Forward, Forward.
Trial 3: Forward, Forward, Right. Left, Right, Right. Forward, Right, Forward. Right, Left, Forward. Right, Left, Forward. Left, Forward.
After entering the Trident Fort, reach the door without being seen
You can silently kill and have bodies discovered just don't let it go into full combat.
Perform 5 grapple swings in a row without touching the ground
The Hoysala Token zone in the south-west has five in a row.
Get 30 seconds of total airtime with the vehicle
Just do a lot of jumping off waterfalls and rocks in Chapter 4.
Complete the shadow puzzle in 10 moves or less
In Chapter 5 you can solve the puzzle like this:
For this I'll label the buttons as a, b, c going to the left of the lever and 1, 2, 3 going to the right of it. Then the button at the opposite ends the same but with an X. L is the lever that activated the puzzle.
Play in the water in the dam in Halebidu
In Chapter 5 jump into the water once you're outside not long after the Shadow Puzzle.
Pick a three pin lock in under 15 seconds
Plant multiple C4 charges on the APC at the same time and destroy it with one massive detonation
Impossible to do on Crushing as it requires five C4 charges.
Perform an impressive dive from the cliff near the old railroad tracks
In Chapter 8 jump off the platform with Treasure 60 into the pool of water below the waterfall.
Destroy the helicopter without defeating any other enemies
Sneak around the back and grab some RPGs from the Lock Boxes and just ignore the other enemies when you run to grapple onto it.
Ram 10 motorcycles
During Chapter 9 while driving a car.
Commandeer 6 vehicles by jumping on them and kicking out the driver
You can jump from car to car, you don't have to go back to the train each time.
Destroy a vehicle in Chapter 9 with an explosive
Throw a grenade as far in advance of a car as you can and hopefully it'll explode perfectly. You could also do as the icon implies and pick up a gas canister from inside a red and brown wooden box, throw it at a car and shoot it to detonate it immediately.
Drive over the edge in the Western Ghats
Drive off the waterfall below where you start Chapter 4.