So, first you need to start a game. Try barbeck race or any custom race which can colonize all planets. I suggest a smaller map, large map games takes longer. Oh wait! larger maps more planets? You dont need to care about that. Progress through the game, try to colonize only good planets, dont colonize weak/bad planets, save them for later, if you colonized a planet in your systems others cant colonize in that system anymore, so expand, fast, however game is like a walking in the park on very easy or even on normal.

As you get to endgame, dont invade the enemies, max 1planet/system so others cant move in to those system, destroy inhabitants instead with planetary bombardment. Destroying the population allows you to colonise them later, however dont colonize them right away! You stronger than your enemies and you dont need those planets, you need just to have 1 planet/system to keep it in your territory.

Finish the game, eliminate all enemies and once done choise to keep playing. Oh wait, in 99% of the games achievements not unlocking after victory claimed! Now this is that 1%, this is why these achievements so easy.

So you finished your game. Hopefully you have now a lot of colonizable planet, at least 30-60. Build enough colonisation ships. Once done move to the planets when all at position, use them to colonize each planet. Oh good, its tiresome right? No panic, you dont need to do it again just use SAVE GAME AFTER you ordered them to colonize and BEFORE hitting end turn button. Congratulations, while end of turn processing you colonized that many planets, you just need spam click through all the colonization animations. NOW LOAD your game, you saved i hope as i said and after you ordered them to colonize right? If yes you now just need hit the end turn button and again a lot of planets got colonized. repeat until you got your 1k.

As you now know that achievements can unlock even after claiming vicotry its obviouos how easy now these achievements. Just spamclick end of turn until 10k achievements shows up, alternativly you can use autoclicker if you dont want to buy a brand new mouse. However, dont leave your computer alone, it will be done in half hour or so max and at around every 400/500th years it gets interrupted by a space worm who want to fight you.

Other achievements of this game are pretty easy and straightforward and using these methods not too time consuming.

However some might be confused about the complete X race quests. If you play lets say Varaian you cant do the complete Varaian missions as you cant give missions for yourself. The best race to get those missions are humans as they dont give any missions. You will be done with the missions faster on a smaller map.

There are enemy races so if you finishing a mission in favour of X race then you cant finish the mission for Y race in that walkthrough unless you save and load. Saving and loading for these missions arent that easy thought, each mission chain require more than one step. Missions are pretty straightforward but here are some hints: destroy neutral fleets and Dig on planets with yellow excalamtion mark.