Crocodile: When killed, do not cut the rope.
Giant insects: Let them vomit on you.
Trap door floor: Salazaar will enjoy sending the spikes impaling Scott Kennedy.
Knife fight: At the end, let him press the knife through the cavity.
Two Los Gigantos: In the magma floor/pool, activate the switch and stand next to the pool.
Chief Mendez: In the barn fight, do not evade his grab in the intermission sequence

Note: Save before each encounter before trying to see the following death scenes.