The story line for Lachelein leading up to Lachelein's Arcane Symbol is all kill, loot, talk to NPC quests. The 190 Arcane Force requirement only applies for the first three hunting maps you can enter, which is where your first two main hunt-and-gather style quests are located. The next portion of the quest line involves an area requiring 210 AF, and the final portion of the Lachelein area (excluding Lucid boss herself) needs 240AF. You can access these areas even if you don't meet the AF requirement, but you will do reduced damage. On the flipside, if you exceed the AF requirement you will deal extra damage which sounds like could be helpful to you.I notice that I should be able to start on Lachlein with only 190 arcane force.
Can I solo these, or is it another one for party quests - whcih I never do?
You can get to Lachelein when you reach level 220 by going to the map to the right of the Hungry Muto PQ and talking to Muto.If solo, how do I get there? From which Chu Chu map?
You're in luck, because the main (fastest, most efficient) way to get to level 250 is to grind mobs on your own, ideally with only the help of non-partied Kishin/Frenzy Totem and HS buff (though the latter is also available as a decent skill in your V matrix).If party, how else can I level to 250, given that I don't party (don't even relly boss)?