It looks like you're trying to build for high AC; the usual advice is don't bother. You're unlikely to have the stats or gear to make it work out on a pure 28-pt rogue; and you're sacrificing DPS for it. Also your skills look a little haphazard; in particular I don't see much point in having so-so Bluff, Diplomacy, and Tumble.
Here are my 28-pt F2P pure Assassin builds. The first is a classic DEX-based halfling using rapiers; the second is a STR-based human using khopeshes. The halfling doesn't require any tomes and will have higher Reflex & to-hit (at least initially), making it easier for newcomers with no twink gear to pull off; but the human gets more skill pts (given the same base INT) and will have higher DPS in the long run. One nice thing about the rogue PrEs is they have no feat pre-reqs, so you can switch between them at any time: e.g., maybe you start off with Mechanic for the boost to trap skills and/or to mess with repeating crossbows; then switch to Assassin later on for the higher SA DPS & other Assassin abilities.
Code:
Character Plan by DDO Character Planner Version 3.8.1
DDO Character Planner Home Page
Level 20 True Neutral Halfling Female
(20 Rogue)
Hit Points: 222
Spell Points: 0
BAB: 15\15\20\25\25
Fortitude: 9
Reflex: 21
Will: 6
Starting Feat/Enhancement
Abilities Base Stats Modified Stats
(28 Point) (Level 1) (Level 20)
Strength 14 14
Dexterity 17 26
Constitution 14 14
Intelligence 12 14
Wisdom 8 8
Charisma 8 8
Level 1 (Rogue)
Feat: (Selected) Two Weapon Fighting
Level 2 (Rogue)
Level 3 (Rogue)
Feat: (Selected) Weapon Finesse
Level 4 (Rogue)
Ability Raise: DEX
Level 5 (Rogue)
Level 6 (Rogue)
Feat: (Selected) Toughness
Level 7 (Rogue)
Level 8 (Rogue)
Ability Raise: DEX
Level 9 (Rogue)
Feat: (Selected) Improved Two Weapon Fighting
Level 10 (Rogue)
Feat: (Rogue Bonus) Opportunist
Level 11 (Rogue)
Level 12 (Rogue)
Ability Raise: DEX
Feat: (Selected) Improved Critical: Piercing Weapons
Level 13 (Rogue)
Feat: (Rogue Bonus) Improved Evasion
Level 14 (Rogue)
Level 15 (Rogue)
Feat: (Selected) Greater Two Weapon Fighting
Level 16 (Rogue)
Ability Raise: DEX
Feat: (Rogue Bonus) Crippling Strike
Level 17 (Rogue)
Level 18 (Rogue)
Feat: (Selected) Power Attack
Level 19 (Rogue)
Feat: (Rogue Bonus) Skill Mastery
Level 20 (Rogue)
Ability Raise: DEX
Enhancement: Rogue Damage Boost I
Enhancement: Rogue Damage Boost II
Enhancement: Rogue Extra Action Boost I
Enhancement: Rogue Extra Action Boost II
Enhancement: Rogue Haste Boost I
Enhancement: Rogue Haste Boost II
Enhancement: Rogue Haste Boost III
Enhancement: Rogue Haste Boost IV
Enhancement: Rogue Deadly Shadow
Enhancement: Halfling Dexterity I
Enhancement: Halfling Dexterity II
Enhancement: Halfling Cunning I
Enhancement: Halfling Cunning II
Enhancement: Halfling Guile I
Enhancement: Halfling Guile II
Enhancement: Rogue Subtle Backstabbing I
Enhancement: Rogue Subtle Backstabbing II
Enhancement: Rogue Subtle Backstabbing III
Enhancement: Racial Toughness I
Enhancement: Racial Toughness II
Enhancement: Rogue Assassin I
Enhancement: Rogue Assassin II
Enhancement: Rogue Assassin III
Enhancement: Rogue Sneak Attack Accuracy I
Enhancement: Rogue Sneak Attack Accuracy II
Enhancement: Rogue Sneak Attack Accuracy III
Enhancement: Rogue Sneak Attack Accuracy IV
Enhancement: Rogue Sneak Attack Training I
Enhancement: Rogue Sneak Attack Training II
Enhancement: Rogue Sneak Attack Training III
Enhancement: Rogue Sneak Attack Training IV
Enhancement: Improved Hide I
Enhancement: Improved Hide II
Enhancement: Improved Move Silently I
Enhancement: Improved Move Silently II
Enhancement: Rogue Dexterity I
Enhancement: Rogue Dexterity II
Code:
Character Plan by DDO Character Planner Version 3.8.1
DDO Character Planner Home Page
Level 20 True Neutral Human Female
(20 Rogue)
Hit Points: 222
Spell Points: 0
BAB: 15\15\20\25\25
Fortitude: 8
Reflex: 16
Will: 5
Starting Feat/Enhancement
Abilities Base Stats Modified Stats
(28 Point) (Level 1) (Level 20)
Strength 16 22
Dexterity 15 18
Constitution 14 14
Intelligence 12 14
Wisdom 8 8
Charisma 8 8
Tomes Used
+2 Tome of Dexterity used at level 8
Level 1 (Rogue)
Feat: (Human Bonus) Toughness
Feat: (Selected) Two Weapon Fighting
Level 2 (Rogue)
Level 3 (Rogue)
Feat: (Selected) Exotic Weapon Proficiency: Khopesh
Level 4 (Rogue)
Ability Raise: STR
Level 5 (Rogue)
Level 6 (Rogue)
Feat: (Selected) Power Attack
Level 7 (Rogue)
Level 8 (Rogue)
Ability Raise: STR
Level 9 (Rogue)
Feat: (Selected) Improved Two Weapon Fighting
Level 10 (Rogue)
Feat: (Rogue Bonus) Opportunist
Level 11 (Rogue)
Level 12 (Rogue)
Ability Raise: STR
Feat: (Selected) Improved Critical: Slashing Weapons
Level 13 (Rogue)
Feat: (Rogue Bonus) Improved Evasion
Level 14 (Rogue)
Level 15 (Rogue)
Feat: (Selected) Greater Two Weapon Fighting
Level 16 (Rogue)
Ability Raise: STR
Feat: (Rogue Bonus) Crippling Strike
Level 17 (Rogue)
Level 18 (Rogue)
Feat: (Selected) Quick Draw
Level 19 (Rogue)
Feat: (Rogue Bonus) Skill Mastery
Level 20 (Rogue)
Ability Raise: STR
Enhancement: Rogue Damage Boost I
Enhancement: Rogue Damage Boost II
Enhancement: Rogue Extra Action Boost I
Enhancement: Rogue Extra Action Boost II
Enhancement: Rogue Haste Boost I
Enhancement: Rogue Haste Boost II
Enhancement: Rogue Haste Boost III
Enhancement: Rogue Haste Boost IV
Enhancement: Rogue Deadly Shadow
Enhancement: Human Adaptability Strength I
Enhancement: Human Improved Recovery I
Enhancement: Human Improved Recovery II
Enhancement: Human Versatility I
Enhancement: Human Versatility II
Enhancement: Rogue Subtle Backstabbing I
Enhancement: Rogue Subtle Backstabbing II
Enhancement: Rogue Subtle Backstabbing III
Enhancement: Rogue Subtle Backstabbing IV
Enhancement: Racial Toughness I
Enhancement: Racial Toughness II
Enhancement: Rogue Faster Sneaking I
Enhancement: Rogue Assassin I
Enhancement: Rogue Assassin II
Enhancement: Rogue Assassin III
Enhancement: Rogue Sneak Attack Accuracy I
Enhancement: Rogue Sneak Attack Accuracy II
Enhancement: Rogue Sneak Attack Accuracy III
Enhancement: Rogue Sneak Attack Accuracy IV
Enhancement: Rogue Sneak Attack Training I
Enhancement: Rogue Sneak Attack Training II
Enhancement: Rogue Sneak Attack Training III
Enhancement: Rogue Sneak Attack Training IV
Enhancement: Improved Hide I
Enhancement: Improved Hide II
Enhancement: Improved Move Silently I
Enhancement: Improved Move Silently II
Enhancement: Rogue Dexterity I
Final human feat is open to debate. Some go with Quick Draw to reduce the delay between activating Haste Boost & attacking; but you could also go for Skill Focus UMD, OTWF, or Combat Expertise (if you take at least a +1 INT tome and still really wanna have a go at AC).