Use a tranq dart and aim for the soft butt or head. Wait 5 to 10 seconds between shots, less wasted ammo, faster KO and less likely to kill. Easy to keep up with, kill everything on the ground around it to ensure a safe start. After KO add cakes and sleepy stuff (narcoberries, narcotic, or bio toxin) stand a bit away incase you are attacked so you don't kill it accidentally. I fly argy when taming snails since usually attacked by troodons and little thieves.
Guys ,achatina eat berry only with a mod
I think it's krakens better dino you can't feed it berries in vanilla ark be aware! They will require so much cake so better not tame one . hope this was helpfull it's my first time writing a tip •~•