Expertise

Each action (and each enemy, route and crop) has its own Expertise level from 1 to 50, raised by repeating it. Milestones give fixed perks on that action only:

Level	Gathering, Aquaculture and combat	Artisan and Seafaring
10	+5% speed	+5% speed
20	+5% double yield	+5% chance to save materials
30	+50% rare finds	+5% double output
40	+10% XP	+10% XP
50	Expert title	Expert title

Completions needed (20 × (level − 1)^1.9, rounded):

Level	Completions
1	0
2	20
3	75
4	161
5	279
6	426
7	602
8	807
9	1,040
10	1,300
11	1,589
12	1,904
13	2,246
14	2,615
15	3,011
16	3,432
17	3,880
18	4,354
19	4,853
20	5,379
21	5,929
22	6,505
23	7,106
24	7,732
25	8,384
26	9,060
27	9,761
28	10,486
29	11,236
30	12,011
31	12,810
32	13,634
33	14,482
34	15,353
35	16,249
36	17,170
37	18,114
38	19,082
39	20,073
40	21,089
41	22,128
42	23,191
43	24,277
44	25,388
45	26,521
46	27,678
47	28,858
48	30,062
49	31,289
50	32,539