If UA is allowed...
Rogue (Scout) 6/Bard (Lore) 3/Wizard (Lore) 2/Cleric (Knowledge) 1/Psion (v2) 1
TOTAL = 13th level
Half-Elf: 2 skills
Background: 2 skills
(Base) Rogue: 4 skills
(M/C) Bard: 1 skill
(Lore) Bard: 3 skills
(Know.) Cleric: 2 skills
Psion: 2 skills
Skilled Feat: 3 skills
=18 skills
Bard 3: 2 expertise
Rogue 1: 2 expertise
(Scout) Rogue 3: 2 expertise
Rogue 6: 2 expertise
(Know.) Cleric 1: 2 expertise
Psion 1: 2 expertise
Wizard 2: 4 expertise
=16 expertise
tl;dr by 13th level, you have proficiency in all skills and expertise in 16/18 of them