I unlocked it today. After many retries and figuring out things I got it.
I tested how the AI pilot would go taxi. So I knew how I had to go when I go do it by myself.
Also with Arrival, I just put a test, quick fly, just putting arrival and as soon as I landed I let my AI pilot do the taxi and to see how he would taxi at Rotterdam airport, so I would know how to.
Now for the test and my previous tries, I set Arrival to Gate A1 at Rotterdam Airport, but I noticed the AI pilot would not go there, instead it went to ramp 13. I flew it before and did not get the achievement wen I set the arrival to Gate A1., I guess it is just not possible for airplanes to make that turn to parking A1, or somehow it gets F upped. I guess you need nice and smooth taxi ways. Don't pick a parking next to the runway like I did on this airport, cause that probably caused the problem. So that is why I picked after testing Parking number 13 on Rotterdam.
So then I thought, lets put it on Arrival Ramp 13. And yes, it worked.
I recorded how I did it, so you can see yourself.
This guide is assuming you know the jet, the F/A-18E/F Super Hornet and know how to use auto pilot.
F/A-18E/F Super Hornet
Complete a non-stop 300+ mile flight from parking to parking spot, without assistance.
LKPR to EHRD
IFR (Low-altitude airways)
LKPR GATE A 3 / Parking - Departures (Direct)
EHRD Ramp 13 / Parking - Arrivals (Direct) - Approach (RNAV 24)
Taxi route at Airport LKPR is: AA Z T A
Taxi route at Airport EHRD is: V3
LKPR
1 RAPET
2 NURGO
3 LATBA
4 VAGAB
5 RUNEN
6 GAPLA
7 DEGOM
8 MISGO
9 DOFMU
10 KAKKO
11 REWIK
12 RD203
13 ATWIT
14 RD252
EHRD
Airport map LKPR:
https://aim.rlp.cz/ais_data/aip/data/valid/a2-pr-adc.pdf(Before I started I made sure everything was set right. Cause if you set it and then change from VFR (Direct-GPS) to IFR (Low-altitude airways) it may change the arrival just to the runway. Also with the Approach, it is set to Automatic and if you change it to RNAV 24, it also might change back to arrival runway 24., so after you have done this, just make sure on the map you see you start from the parking and you end at the parking, just double check everything is set right.)
Also don't forget to put your fuel on 100% before you start, I had some tries when I forgot that and had to go back to the main menu.
And of course your setting needs to be on True To Life.. you can see in the video I check it if it is still on.
And last, always check ATC, respond to ATC when needed.