If you are using the A77, you should try using Single shot AF, instead of Continuous AF.These were hand held with the SLT-A77, the original one (not the ii).Are those images on a Tripod? If so, SSS should be off.The camera was probably in program mode, autofocus C or possibly S.
If they are taken by hand, then you may need to shore up your body position to keep your arms and hands steady. Its tougher as we get older.
Are you using an A77 or an A77ii? If its an A77ii, turn off Stabilized with Shutter.
I need to work on holding the camera steady and being sure the camera locks focus. Along with shutter speed high enough and paying attention to DOF. I'll try to use shutter or aperture priority rather than Program or Auto. I think more manual focus. Back with the AE-1 it was all manual focus and shutter, and those are almost all in focus!
Most of my travel photos are when we are touring something, or even just walking around town when I see something I want to photograph. Unfortunately, my family group just keeps going. So I try to hurry my shots and catch up. I know it is on me to get the picture correct, there is just pressure to take the shot and move on quickly.
IMO the older cameras like the A77 and A99, A65... etc do not have the best Continuous AF.