If you’re trying to kill this bro for the achievement, here’s how I did it. Get yourself a Quetzal with a platform and put about nine auto turrets on it. Put about 100 bullets in each turret and find yourself a Giga. Make sure the turrets are on high range and turn them on as soon as you’re close to the Giga so you waste as little bullets as possible. Just start circling the Giga and stay out of the hit range. Boom, dead Giga in about five minutes.
I was playing on a nice multiplayer survee with nice people, I got a bronto, mutated blue wolf, eerie tapejara, and an argie. I join a tribe with someone and we go to his base (on the back of fars peak and right across from carnivore island) and one day I spawn in, and see one of my arges died, I'm like oh. It must have starved. That's sad. Then I look at the logs and see "your dodo has been killed by a giganotosaurus!" I instantly start panicking and I type in the chat about it. Everyone is curious. Low and behold I see a giant giga tail right next to my flimsy base with spike walls. It agros on me, and I start RUNNING. My bronto attacks it and the behemoths fight. My bronto's death was not in vein though. I had enough time to save 5 out of 17 dinos. I'd say that's pretty good compared to nothing. I still have their graves to this day.
Never fight a Wild Giganotosaurus head on unless you wanna get rekkt!! If you have tamed a low level wild giga e.g 20-85 ish, be careful around Alpha T-Rex’s as they can still pack quite a punch! I nearly lost my level 85 giga because I had no stamina etc.
Never fight a wild giga with a tamed giga, a wild giga has 80,000 health and your tamed will usually be around 25,000 health. Also the wild giga will do more damage a bite and also has a health drain effect.