100% Achievement Guide

Watch the following video to be able to obtain the right equipment for an easy fight. They're 100% guaranteed to be in their following locations

"Ring the mysterious bell. What happens after that, is up to you."
Fight for your life, hide behind a door or face off against Dr. Salvador, the choice is yours.
The achievement will be yours after the village fight.

"Summon the master of the lake. Don't rock the boat."
Funny way to scare your friend. Before you get on the boat, walk to the edge and shoot the water. Boom, easy achievement

"Outmaneuver the rampaging beast, El Gigante."
If you collected all the grenades in the first section, follow the instructions in the following video for an easy battle. Tested on Professional mode

"Rescue the president's daughter, Ashley. Afterwards, the real fun begins."
Ashley is trapped in a room, you gotta solve a puzzle to set her free.

"Defeat the village chief in battle."
If you collected all the grenades in the first section, follow the instructions in the following video for an easy battle. Tested on Professional mode

"Turn the tables on Verdugo, the right hand of Salazar."
The easiest way to defeat Verdugo is to buy a rocket launcher from the merchant, knock over a tank to freeze him and fire away.

"Defeat Salazar, and make your escape from the castle."
A pretty easy boss. Buy a rocket launcher before fighting him. Shoot his exposed eye until he reveals himself and fire away. I'm noticing a pattern here

"Defeat Krauser, your former partner, in battle."
This fight can be a little tricky, a pure bullet sponge that dodges your shots at any given moment.

But there's one weapon that can give him a run for his money, The Knife! Speedrunners have made Krauser a complete joke

"Defeat Saddler in battle, and escape from the nightmare."
GO FOR THE EYES, GO FOR THE EYES, GO FOR THE EYES
You already know what weapon you're gonna use to bring him down ;)

"Acquire all of the bottle caps in the game."
Look out for Blue Icons on your map titled "Sub Mission" They're locations for the shooting ranges where you can earn bottlecaps as well as a gold reward for completing a row. There are a total of 4 rows you can complete.
Locations are during chapters:
3-1 Before Ashley gets trapped at the end of Ch. 3-1.
4-1 Near the door where you obtain the King's Grail.
4-2 Just before you enter the mines (Where the Ganados appear again).
5-1 At the armory.
5-3 Follow the tunnel, the merchant will be at the end before you head up the ladder.
If you missed a location, that's okay. Previous games will be available to complete.

"Acquire all of the costumes in the game."
NORMAL
The base costume for your first playthrough

SPECIAL 1
You unlock the RPD outfit when beating the game for the first time. Ashley also gets a different outfit as well as Ada that appear during cutscenes.
(note. you can't change Ada's costume during 'Separate Ways', just using it as reference for Leons campaign)
SPECIAL 2
You unlock the Mafia outfit when beating Ada's Campaign "Separate Ways". Ashley also gets an indestructible suit of armor. She cannot be harmed and when enemies try to carry her, they'll fall over. These costumes won't appear during cutscenes though.

"Clear the game on the highest difficulty."
Here we go again. Beating the game on Professional will grant you an achievement as well as the P.R.L 4.12, one of the most overpowered weapons in the game. The grenade tricks for El Gigante and the Big Cheese work on Professional so you can use that to your advantage.

Thanks for checking the guide out. This was my first guide, not really toooo sure how it compares to normal ones but whatevs ¯\_(ツ)_/¯
Make sure to rate up so other people can see this guide as well.