Good way do deal with "Stay on Target" and "Sic Semper Tyrannis"

[EndlessPlayer]

So today I was trying with friend to get both achievement: Stay on Target and Sic Semper Tyrannis. While event on fastest speed this could take a bit a while a few days to pass month, I found out in friend account that he don't get any achievement, as I was thinking that I forgot to check the Ironman mode, but when I check that in lobby I can't choose to check Ironman unlike in Singleplayer, I now wonder, how I can get both achievement playing agains AI. I know that Colossus can be spawn on Fallen Empire, if you piss of, but this is hard to kill him, espacially that they always stay with one fleet, and about Sic Tyrannis is hard, because, often others empire will always choose player as the Custodian.
So, somebody has a idea how to get both this achievements?

[RCMidas]

Halfway through a war against a Fallen Empire, I realised that "Stay on Target" triggered when I accidentally destroyed THEIR Colossus whilst MINE was firing on a planet. So that's something to consider - the game may get confused from time to time.

Regarding "Sic Semper Tyrannis", the trick is to be the strongest empire diplomatically, with an Authoritarian Ethic, and either set up a vassal to be released or wage an Ideology war. Force them to become Custodian, even against their will, by nominating them for the post. At that point, just wait for them to try becoming Galactic Emperor and support them, then betray them after.

NOTE: You must not destroy their last planet with a Colossus or Star-Eater or bombardment or what-have-you. The AI empire MUST still exist at the end of the war and you must choose to enforce your war goals. So don't be like me, who set up a Payback game against Minamar Specialised Industries and blew up their capital, forcing me to repeat the entire exercise on a new game where the AI decided to take the Subterfuge Tradition and made the process take about three times longer.

Oh yeah, whatever you can do to make the spy process easier - do it. Take the Subterfuge and Psionics/Virtuality Tradition yourself, seek out the Orvall system to revive the Fumongus, appoint Ambassador Officials with the Shady Contacts trait to your council (potential post-astral rift paragon Mercedes Romeo also has a Codebreaking bonus), and maybe even reform your Civics with Cutthroat Politics and/or Shadow Council, and turn on the Bureau of Espionage Edict (and the Dark Consortium Civic gives another possible Edict). Whatever attempts the AI makes to ramp up its Encryption and make it absolutely awful to conduct espionage against it, preemptively counter by stacking Codebreaking bonuses.

[Mennan]

I mean i haven't bothered with achievements in a while but cant you still just roll the game in and out of multi player to force each empire to do exactly what you want until you get the achievements you want?

[RCMidas]

??? How does that work?

[EndlessPlayer]

Originally posted by RCMidas:

??? How does that work?

Quoting from Stellaris wiki from tips on Sic Semper Tyrannis: You can host your singleplayer game in a multiplayer session.
But I don't know, how can be done, but maybe I will try get this achievement that way - hopefully.
" Halfway through a war against a Fallen Empire, I realised that "Stay on Target" triggered when I accidentally destroyed THEIR Colossus whilst MINE was firing on a planet. So that's something to consider - the game may get confused from time to time. "
I was checking your profile for curiosity and found out that you make this achievement in this month, so I am happy to see that this is some strange bug that can help me to get this achievement, so thank you for giving me hope for that