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CK2: The Marriage Game
EU4: Until Death do us part
HOI4: a Friend in need
Stellaris: Either Brave new worlds or Domo Arigato, depending on how you start
Edit:Misread that wildly, easist would be stellaris, very few challenge achievements most are rng dependent than anything
 
Stellaris has the most easy achievements, but also some of the hardest RNG based achievements.
 
I haven't played CK2 in quite some time, but based on the last time I did I would say that one. Many of those achievements aren't really start dependent the way other games' achievements tend to be, which means you have basically the entire game starting from nearly any place in the game to get them. That doesn't make all of them easy, but it does mean that getting 90% of the way there and screwing something up isn't "it" - you have plenty of time to rectify your error. And it's the only game that gives you unfettered control over start date while also not (generally) restricting your achievements to any particular start date, a very nice advantage.

After that...Stellaris, once you emerge from the early game, is pretty straightforward but as noted has a lot of RNG ones. And at least in my experience, getting out of the first 50-75 years without losing out to the AI can be a real throw of the dice (please don't judge me too harshly, I usually rely on diplomacy a lot and Stellaris basically has none of that). HOI4 has annoying ones but for the most part are pretty straightforward, if only due to the vast chasm separating player competency and AI competency. With the exception of a truly vast difference in power (player Venezuela defending against USA, for example), it's nigh impossible for the player to lose a HOI4 war.
 
I think - over all - the easiest achievements are from HoI IV (and maybe Stellaris of which I do not know the newer ones). HoI's achievements can be expressed as: Conquer the world as X (switch to ideology Z) and try to grab as many achievements as you can on the way. There are some achievements which you don't do "by accident" (Bearer of Artillery, Crusader Kings I/II and some other come to mind) but most are.

CKII and EUIV do have some very easy achievements but both have some very "special" ones which are very, very hard or based on pure RNG.
 
Having tried for several 'chievos, Stellaris has the easiest by miles, rng or not, play several games in smallest galaxy and you'll get them, there's enough replayabiility to make runs interesting

HoI4 ones are usually tedious, but that might be more the flaw of the game, which becomes tedious soon and is very inflexible in approach

EU4 feels like every other one needs you to do WC or close to it, and WCs here are tedious too (for me), but you have good variety of options, there's more than a single way to advance unlike HoI4

CK2, I don't know, feels like you need some luck with RNG and good knowledge of game mechanics, they are the least appealing to me of them all
 
EU4 feels like every other one needs you to do WC or close to it, and WCs here are tedious too (for me), but you have good variety of options, there's more than a single way to advance unlike HoI4

Too true. My percentage hovers in the 50% range because I won't do any of the WC / near WC type achievements. I did one WC in EU 3 and found the last 150 years to be a complete bore and I'm sure it would be the same in EU IV.

I'm at a point in CK 2 where I have a similar complaint, most of the achievements I have left require excessive unrealistic blobbing, playing overpowered boring start positions, or playing in the part of the map that never should have been added in the first place (IMO).
 
HoI4 is the easiest game overall- by a large margin. The challenging part about any of the achievements is not having a bug or the AI ruin it for you before you get it.
 
EU4 has a lot of what I consider to be tedious, dumb, and pointless achievements that I will literally never bother pursuing. (See, Norwegian Wood, Laughingstock, Switzerlake, etc). Some of them are just a play on words and have no gameplay value whatsoever.
 
EU4 has a lot of what I consider to be tedious, dumb, and pointless achievements that I will literally never bother pursuing. (See, Norwegian Wood, Laughingstock, Switzerlake, etc). Some of them are just a play on words and have no gameplay value whatsoever.

Achievements are fun and I would never think any one of them should be removed. The punny ones are harmless and funny. This is coming from someone who never plays Ironman and never gets any achievements.
 
EU4 has a lot of what I consider to be tedious, dumb, and pointless achievements that I will literally never bother pursuing. (See, Norwegian Wood, Laughingstock, Switzerlake, etc). Some of them are just a play on words and have no gameplay value whatsoever.

I don't mind the punny ones like Laughingstock but all the WC/near WC ones can diaf. WC is just extended tedium beyond a certain point in the game when you become unstoppable and are just mopping up...
 
Just don't do them then. What's the point in spending your time complaining and making everyone else annoyed with you?

The point of me spending my time talking about them was because the OP asked about them. Many of them are difficult and tedious to accomplish, but I personally do not consider them worth accomplishing.
 
Overall HOI4 has the easiest set of achievements to get, not many of them and you can get several of them in a single campaign.

EU4 is the one with most achievements. It has a ton of really easy ones and a ton more of almost imposible (AKA tedious) to get such as The Three Mountains.

I haven’t played much CK2 so I can’t talk about that.

In my opinion EU4 will take you several hundred/thousand hours just to feel comfortable enough to get the medium-hard/hard ones while you can get most of HOI4 ones in a few hundred hours.
 
Overall HOI4 has the easiest set of achievements to get, not many of them and you can get several of them in a single campaign.

EU4 is the one with most achievements. It has a ton of really easy ones and a ton more of almost imposible (AKA tedious) to get such as The Three Mountains.

I haven’t played much CK2 so I can’t talk about that.

In my opinion EU4 will take you several hundred/thousand hours just to feel comfortable enough to get the medium-hard/hard ones while you can get most of HOI4 ones in a few hundred hours.
Tbf a lot of HoI4 achievements can be called tedious/difficult like EU4s. Still, nothing like Three mountains yet.
Although the Romanian achievements feel like such
 
I think each Paradox game since they appeared after CK2's release has had a different approach to what these achievements are for. There are a set of highlights of game mechanics and features to encourage players to try them and then there are also a set of challenges to push people in a certain way.

I've not played Hearts of Iron, but if you have the stamina to stay in a game for 600 years then you can get the majority of Stellaris achievements in 2 games. As a new game maybe Paradox didn't know whether Stellaris would be as popular as it became and so it feels to me like many more of the achievements are highlights rather than challenges. (And even then the challenges are more often luck/RNG based than skill based.)

There are several "easier" objective ones in EU4 and CK2, but it will take you many more games played to get the same spread.